Build docker image with GHA

Also ensure cleanup is run on build completion

.github/workflows/cleanup.yml

@@ -0,0 +1,21 @@
+name: Prune images
+on:
+  workflow_run:
+    workflows: [Build Docker fastcgi image]
+    types: [completed]
+
+jobs:
+  prune:
+    runs-on: ubuntu-latest
+    steps:
+    - name: prune
+      uses: vlaurin/[email protected]
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        organization: silnrsi
+        container: typetunerweb
+        dry-run: false
+        keep-younger-than: 7
+        keep-last: 6
+        prune-tags-regexes: ^.*$
+        prune-untagged: true

.github/workflows/dockerimage.yml

@@ -0,0 +1,59 @@
+name: Build Docker fastcgi image
+on:
+  push:
+    branches: [ "main", "dockerization" ]
+    paths-ignore:
+    - kubernetes/**
+    - LICENSE
+    - README.md
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      # Workaround: https://github.com/docker/build-push-action/issues/461
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@v2
+
+      # Login against a Docker registry except on PR
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value={{date 'GGWWEHHmm'}}
+            type=raw,value=latest
+          labels: |
+            org.opencontainers.image.description=TypeTunerWeb for customising default OpenType features on selected fonts
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

@@ -1,5 +1,8 @@
 # syntax=docker/dockerfile:1
 FROM alpine
+LABEL org.opencontainers.image.source=https://github.com/silnrsi/typetunerweb
+LABEL org.opencontainers.image.description="TypeTunerWeb for customising default OpenType features on selected fonts"
+LABEL org.opencontainers.image.licenses=MIT
 COPY --link web/server/fonts?go.cgi /var/www/typetunerweb/web/server/
 COPY --link web/server/TypeTuner/typetuner.pl /var/www/typetunerweb/web/server/TypeTuner/
 VOLUME /tunable-fonts