diff --git a/.dockerignore b/.dockerignore
index 36f542d..ccc2930 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,6 +1,2 @@
-/.dev
 /coverage
-/dist
-/lib
 /node_modules
-/.env
diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index be00b1c..ab5fe57 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -2,7 +2,8 @@
 
 Hi there! We're thrilled that you'd like to contribute to this project. Your help is essential for keeping it great.
 
-Contributions to this project are [released](https://help.github.com/articles/github-terms-of-service/#6-contributions-under-repository-license) to the public under the [project's open source license](LICENSE).
+Contributions to this project are [released](https://docs.github.com/en/github/site-policy/github-terms-of-service#6-contributions-under-repository-license)
+to the public under the [project's open source license](LICENSE).
 
 ## Submitting a pull request
 
@@ -18,6 +19,7 @@ Contributions to this project are [released](https://help.github.com/articles/gi
 
 Here are a few things you can do that will increase the likelihood of your pull request being accepted:
 
+- Write tests.
 - Make sure the `README.md` and any other relevant **documentation are kept up-to-date**.
 - We try to follow [SemVer v2.0.0](https://semver.org/). Randomly breaking public APIs is not an option.
 - Keep your change as focused as possible. If there are multiple changes you would like to make that are not dependent upon each other, consider submitting them as **separate pull requests**.
@@ -26,5 +28,5 @@ Here are a few things you can do that will increase the likelihood of your pull
 ## Resources
 
 - [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)
-- [Using Pull Requests](https://help.github.com/articles/about-pull-requests/)
-- [GitHub Help](https://help.github.com)
+- [Using Pull Requests](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-requests)
+- [GitHub Help](https://docs.github.com/en)
diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
index 1c2136d..d50d109 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -30,4 +30,5 @@ about: Create a report to help us improve
 
 ### Logs
 
-> Download the [log file of your build](https://help.github.com/en/actions/configuring-and-managing-workflows/managing-a-workflow-run#downloading-logs) and [attach it](https://help.github.com/en/github/managing-your-work-on-github/file-attachments-on-issues-and-pull-requests) to this issue.
+> Download the [log file of your build](https://docs.github.com/en/actions/managing-workflow-runs/using-workflow-run-logs#downloading-logs)
+> and [attach it](https://docs.github.com/en/github/managing-your-work-on-github/file-attachments-on-issues-and-pull-requests) to this issue.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dc454fd..d7de2a3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,12 +1,18 @@
 name: ci
 
 on:
+  schedule:
+    - cron: '0 10 * * *' # everyday at 10am
   push:
     branches:
-      - master
+      - 'master'
+      - 'releases/v*'
+    tags:
+      - 'v*'
   pull_request:
     branches:
-      - master
+      - 'master'
+      - 'releases/v*'
 
 jobs:
   bake:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6c8bd39..6374ea5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,13 +5,10 @@ on:
     branches:
       - 'master'
       - 'releases/v*'
-    paths-ignore:
-      - '**.md'
   pull_request:
     branches:
       - 'master'
-    paths-ignore:
-      - '**.md'
+      - 'releases/v*'
 
 jobs:
   test:
@@ -22,10 +19,11 @@ jobs:
         uses: actions/checkout@v2
       -
         name: Test
-        run: docker buildx bake test
+        uses: docker/bake-action@v1
+        with:
+          targets: test
       -
         name: Upload coverage
         uses: codecov/codecov-action@v1
         with:
-          token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage/clover.xml
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 0134e68..c40e98f 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -5,13 +5,10 @@ on:
     branches:
       - 'master'
       - 'releases/v*'
-    paths-ignore:
-      - '**.md'
   pull_request:
     branches:
       - 'master'
-    paths-ignore:
-      - '**.md'
+      - 'releases/v*'
 
 jobs:
   validate:
@@ -22,4 +19,6 @@ jobs:
         uses: actions/checkout@v2
       -
         name: Validate
-        run: docker buildx bake validate
+        uses: docker/bake-action@v1
+        with:
+          targets: validate
diff --git a/Dockerfile.dev b/Dockerfile.dev
deleted file mode 100644
index 452d06f..0000000
--- a/Dockerfile.dev
+++ /dev/null
@@ -1,59 +0,0 @@
-#syntax=docker/dockerfile:1.2
-
-FROM node:12 AS deps
-WORKDIR /src
-COPY package.json yarn.lock ./
-RUN --mount=type=cache,target=/src/node_modules \
-  yarn install
-
-FROM scratch AS update-yarn
-COPY --from=deps /src/yarn.lock /
-
-FROM deps AS validate-yarn
-COPY .git .git
-RUN status=$(git status --porcelain -- yarn.lock); if [ -n "$status" ]; then echo $status; exit 1; fi
-
-FROM deps AS base
-COPY . .
-
-FROM base AS build
-RUN --mount=type=cache,target=/src/node_modules \
-  yarn build
-
-FROM deps AS test
-COPY --from=docker /usr/local/bin/docker /usr/bin/
-ARG TARGETOS
-ARG TARGETARCH
-ENV RUNNER_TEMP=/tmp/github_runner
-ENV RUNNER_TOOL_CACHE=/tmp/github_tool_cache
-ARG BUILDX_VERSION=v0.5.1
-RUN mkdir -p /usr/local/lib/docker/cli-plugins \
-  && curl -fsSL https://github.com/docker/buildx/releases/download/$BUILDX_VERSION/buildx-$BUILDX_VERSION.$TARGETOS-$TARGETARCH > /usr/local/lib/docker/cli-plugins/docker-buildx \
-  && chmod +x /usr/local/lib/docker/cli-plugins/docker-buildx \
-  && docker buildx version
-COPY . .
-RUN --mount=type=cache,target=/src/node_modules \
-  yarn run test
-
-FROM scratch AS test-coverage
-COPY --from=test /src/coverage /coverage/
-
-FROM base AS run-format
-RUN --mount=type=cache,target=/src/node_modules \
-  yarn run format
-
-FROM scratch AS format
-COPY --from=run-format /src/src/*.ts /src/
-
-FROM base AS validate-format
-RUN --mount=type=cache,target=/src/node_modules \
-  yarn run format-check
-
-FROM scratch AS dist
-COPY --from=build /src/dist/ /dist/
-
-FROM build AS validate-build
-RUN status=$(git status --porcelain -- dist); if [ -n "$status" ]; then echo $status; exit 1; fi
-
-FROM base AS dev
-ENTRYPOINT ["bash"]
diff --git a/docker-bake.hcl b/docker-bake.hcl
index cf19424..7054cf7 100644
--- a/docker-bake.hcl
+++ b/docker-bake.hcl
@@ -1,54 +1,67 @@
+variable "NODE_VERSION" {
+  default = "12"
+}
+
+target "node-version" {
+  args = {
+    NODE_VERSION = NODE_VERSION
+  }
+}
+
 group "default" {
   targets = ["build"]
 }
 
 group "pre-checkin" {
-  targets = ["update-yarn", "format", "build"]
+  targets = ["vendor-update", "format", "build"]
 }
 
 group "validate" {
-  targets = ["validate-format", "validate-build", "validate-yarn"]
-}
-
-target "dockerfile" {
-  dockerfile = "Dockerfile.dev"
-}
-
-target "update-yarn" {
-  inherits = ["dockerfile"]
-  target = "update-yarn"
-  output = ["."]
+  targets = ["format-validate", "build-validate", "vendor-validate"]
 }
 
 target "build" {
-  inherits = ["dockerfile"]
-  target = "dist"
+  inherits = ["node-version"]
+  dockerfile = "./hack/build.Dockerfile"
+  target = "build-update"
   output = ["."]
 }
 
-target "test" {
-  inherits = ["dockerfile"]
-  target = "test-coverage"
-  output = ["."]
+target "build-validate" {
+  inherits = ["node-version"]
+  dockerfile = "./hack/build.Dockerfile"
+  target = "build-validate"
 }
 
 target "format" {
-  inherits = ["dockerfile"]
-  target = "format"
+  inherits = ["node-version"]
+  dockerfile = "./hack/build.Dockerfile"
+  target = "format-update"
   output = ["."]
 }
 
-target "validate-format" {
-  inherits = ["dockerfile"]
-  target = "validate-format"
+target "format-validate" {
+  inherits = ["node-version"]
+  dockerfile = "./hack/build.Dockerfile"
+  target = "format-validate"
 }
 
-target "validate-build" {
-  inherits = ["dockerfile"]
-  target = "validate-build"
+target "vendor-update" {
+  inherits = ["node-version"]
+  dockerfile = "./hack/vendor.Dockerfile"
+  target = "update"
+  output = ["."]
 }
 
-target "validate-yarn" {
-  inherits = ["dockerfile"]
-  target = "validate-yarn"
+target "vendor-validate" {
+  inherits = ["node-version"]
+  dockerfile = "./hack/vendor.Dockerfile"
+  target = "validate"
+}
+
+target "test" {
+  inherits = ["node-version"]
+  dockerfile = "./hack/test.Dockerfile"
+  target = "test-coverage"
+  output = ["./coverage"]
 }
diff --git a/hack/build.Dockerfile b/hack/build.Dockerfile
new file mode 100644
index 0000000..a0796d7
--- /dev/null
+++ b/hack/build.Dockerfile
@@ -0,0 +1,42 @@
+# syntax=docker/dockerfile:1.2
+ARG NODE_VERSION
+
+FROM node:${NODE_VERSION}-alpine AS base
+RUN apk add --no-cache cpio findutils git
+WORKDIR /src
+
+FROM base AS deps
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn install
+
+FROM deps AS build
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn run build && mkdir /out && cp -Rf dist /out/
+
+FROM scratch AS build-update
+COPY --from=build /out /
+
+FROM build AS build-validate
+RUN --mount=type=bind,target=.,rw \
+  git add -A && cp -rf /out/* .; \
+  if [ -n "$(git status --porcelain -- dist)" ]; then \
+    echo >&2 'ERROR: Build result differs. Please build first with "docker buildx bake build"'; \
+    git status --porcelain -- dist; \
+    exit 1; \
+  fi
+
+FROM deps AS format
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn run format \
+  && mkdir /out && find . -name '*.ts' -not -path './node_modules/*' | cpio -pdm /out
+
+FROM scratch AS format-update
+COPY --from=format /out /
+
+FROM deps AS format-validate
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn run format-check \
diff --git a/hack/test.Dockerfile b/hack/test.Dockerfile
new file mode 100644
index 0000000..6a6c5d6
--- /dev/null
+++ b/hack/test.Dockerfile
@@ -0,0 +1,23 @@
+# syntax=docker/dockerfile:1.2
+ARG NODE_VERSION
+
+FROM node:${NODE_VERSION}-alpine AS base
+RUN apk add --no-cache git
+WORKDIR /src
+
+FROM base AS deps
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn install
+
+FROM deps AS test
+ENV RUNNER_TEMP=/tmp/github_runner
+ENV RUNNER_TOOL_CACHE=/tmp/github_tool_cache
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  --mount=type=bind,from=crazymax/docker,source=/usr/libexec/docker/cli-plugins/docker-buildx,target=/usr/libexec/docker/cli-plugins/docker-buildx \
+  --mount=type=bind,from=crazymax/docker,source=/usr/local/bin/docker,target=/usr/bin/docker \
+  yarn run test --coverageDirectory=/tmp/coverage
+
+FROM scratch AS test-coverage
+COPY --from=test /tmp/coverage /
diff --git a/hack/vendor.Dockerfile b/hack/vendor.Dockerfile
new file mode 100644
index 0000000..dd7906b
--- /dev/null
+++ b/hack/vendor.Dockerfile
@@ -0,0 +1,23 @@
+# syntax=docker/dockerfile:1.2
+ARG NODE_VERSION
+
+FROM node:${NODE_VERSION}-alpine AS base
+RUN apk add --no-cache git
+WORKDIR /src
+
+FROM base AS vendored
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/src/node_modules \
+  yarn install && mkdir /out && cp yarn.lock /out
+
+FROM scratch AS update
+COPY --from=vendored /out /
+
+FROM vendored AS validate
+RUN --mount=type=bind,target=.,rw \
+  git add -A && cp -rf /out/* .; \
+  if [ -n "$(git status --porcelain -- yarn.lock)" ]; then \
+    echo >&2 'ERROR: Vendor result differs. Please vendor your package with "docker buildx bake vendor-update"'; \
+    git status --porcelain -- yarn.lock; \
+    exit 1; \
+  fi