add workflow - define image

.gitea/workflows/build_push.yaml

@@ -0,0 +1,28 @@
+name: Build and Publish Docker Image
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest-intranet
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Login to Docker Registry
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.psi.ch
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: gitea.psi.ch/${{ github.repository }}:latest

Dockerfile

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+FROM alpine:3.22
+
+WORKDIR /tmp
+
+RUN apk list -I && apk --no-cache add \
+    libatomic readline readline-dev libxml2 libxml2-dev \
+    ncurses-terminfo-base ncurses-terminfo \
+    libxslt libxslt-dev zlib-dev zlib \
+    ruby ruby-dev yaml yaml-dev \
+    libffi-dev build-base git nodejs \
+    && gem env \
+    && gem install etc \
+    && gem install bundler