Build Docker images on CI.

.forgejo/workflows/ci.yaml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  push: [main]
+  pull_request: [main]
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: codeberg-small-lazy
+    container:
+      image: docker.io/library/debian:bookworm
+    steps:
+      - name: Install dependencies
+        run: |
+          apt-get -y update
+          apt-get -y install buildah ca-certificates nodejs
+      - name: Check out source code
+        uses: https://code.forgejo.org/actions/checkout@v5
+      - if: ${{ forge.repository == 'whitequark/git-pages' && 'true' || 'false' }}
+        name: Log into container registry
+        run: |
+          buildah login --authfile=/tmp/authfile.json \
+            -u whitequark -p ${{ secrets.PACKAGES_TOKEN }} codeberg.org
+      - name: Build container
+        uses: https://codeberg.org/actions/buildah-simple@main
+        with:
+          context: .
+          tag: "codeberg.org/whitequark/git-pages:latest"
+          push: ${{ forge.repository == 'whitequark/git-pages' && 'true' || 'false' }}
+          authfile: /tmp/authfile.json