diff --git a/__tests__/context.test.ts b/__tests__/context.test.ts
index f24a554..b1d49ec 100644
--- a/__tests__/context.test.ts
+++ b/__tests__/context.test.ts
@@ -32,7 +32,7 @@ describe('getInputs', () => {
   });
 
   // prettier-ignore
-  test.each([
+  const cases: [number, Map<string, string>, context.Inputs][] = [
     [
       0,
       new Map<string, string>([
@@ -41,7 +41,7 @@ describe('getInputs', () => {
       {
         version: '',
         cacheBinary: true,
-      } as context.Inputs
+      }
     ],
     [
       1,
@@ -52,18 +52,16 @@ describe('getInputs', () => {
       {
         version: 'v2.32.4',
         cacheBinary: false
-      } as context.Inputs
+      }
     ]
-  ])(
-    '[%d] given %p as inputs, returns %p',
-    async (num: number, inputs: Map<string, string>, expected: context.Inputs) => {
-      inputs.forEach((value: string, name: string) => {
-        setInput(name, value);
-      });
-      const res = await context.getInputs();
-      expect(res).toEqual(expected);
-    }
-  );
+  ];
+  test.each(cases)('[%d] given %o as inputs, returns %o', async (num: number, inputs: Map<string, string>, expected: context.Inputs) => {
+    inputs.forEach((value: string, name: string) => {
+      setInput(name, value);
+    });
+    const res = await context.getInputs();
+    expect(res).toEqual(expected);
+  });
 });
 
 // See: https://github.com/actions/toolkit/blob/master/packages/core/src/core.ts#L67
diff --git a/__tests__/setup.unit.ts b/__tests__/setup.unit.ts
index e662121..e24bae5 100644
--- a/__tests__/setup.unit.ts
+++ b/__tests__/setup.unit.ts
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import os from 'node:os';
 import path from 'node:path';
 
-const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'docker-actions-toolkit-'));
+const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'docker-setup-compose-action-'));
 
 process.env = Object.assign({}, process.env, {
   TEMP: tmpDir,
diff --git a/dev.Dockerfile b/dev.Dockerfile
index de32889..e4f6e5a 100644
--- a/dev.Dockerfile
+++ b/dev.Dockerfile
@@ -3,10 +3,11 @@
 ARG NODE_VERSION=20
 
 FROM node:${NODE_VERSION}-alpine AS base
-RUN apk add --no-cache cpio findutils git
+RUN apk add --no-cache cpio findutils git rsync
 WORKDIR /src
 RUN --mount=type=bind,target=.,rw \
   --mount=type=cache,target=/src/.yarn/cache <<EOT
+  set -e
   corepack enable
   yarn --version
   yarn config set --home enableTelemetry 0
@@ -34,18 +35,27 @@ RUN --mount=type=bind,target=.,rw <<EOT
 EOT
 
 FROM deps AS build
-RUN --mount=type=bind,target=.,rw \
+RUN --mount=target=/context \
   --mount=type=cache,target=/src/.yarn/cache \
-  --mount=type=cache,target=/src/node_modules \
-  yarn run build && mkdir /out && cp -Rf dist /out/
+  --mount=type=cache,target=/src/node_modules <<EOT
+  set -e
+  rsync -a /context/. .
+  rm -rf dist
+  yarn run build
+  mkdir /out
+  cp -r dist /out
+EOT
 
 FROM scratch AS build-update
 COPY --from=build /out /
 
 FROM build AS build-validate
-RUN --mount=type=bind,target=.,rw <<EOT
+RUN --mount=target=/context \
+  --mount=target=.,type=tmpfs <<EOT
   set -e
+  rsync -a /context/. .
   git add -A
+  rm -rf dist
   cp -rf /out/* .
   if [ -n "$(git status --porcelain -- dist)" ]; then
     echo >&2 'ERROR: Build result differs. Please build first with "docker buildx bake build"'
@@ -58,8 +68,7 @@ FROM deps AS format
 RUN --mount=type=bind,target=.,rw \
   --mount=type=cache,target=/src/.yarn/cache \
   --mount=type=cache,target=/src/node_modules \
-  yarn run format \
-  && mkdir /out && find . -name '*.ts' -not -path './node_modules/*' -not -path './.yarn/*' | cpio -pdm /out
+  yarn run format && mkdir /out && find . -name '*.ts' -not -path './node_modules/*' -not -path './.yarn/*' | cpio -pdm /out
 
 FROM scratch AS format-update
 COPY --from=format /out /
diff --git a/tsconfig.json b/tsconfig.json
index 1fc12fb..be1cc9f 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,7 +3,6 @@
     "module": "nodenext",
     "moduleResolution": "nodenext",
     "esModuleInterop": true,
-    "strict": true,
     "newLine": "lf",
     "outDir": "./lib",
     "rootDir": "./src",
diff --git a/vitest.config.ts b/vitest.config.ts
index 2b8712b..b5ac930 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -1,19 +1,3 @@
-/**
- * Copyright 2026 actions-toolkit authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
 import {defineConfig} from 'vitest/config';
 
 export default defineConfig({
@@ -26,7 +10,7 @@ export default defineConfig({
       provider: 'v8',
       reporter: ['clover'],
       include: ['src/**/*.ts'],
-      exclude: ['src/**/main.ts', '__tests__/**', 'dist/**']
+      exclude: ['src/**/main.ts']
     }
   }
 });