147 - Run CI in a prebuilt image instead of installing PHP each run

.forgejo/workflows/ci.yml

@@ -10,17 +10,10 @@ jobs:
   ci:
     runs-on: docker
     container:
-      image: catthehacker/ubuntu:act-latest
+      image: forge.lvl0.xyz/lvl0/fedi-feed-router-ci:latest
     steps:
       - uses: https://data.forgejo.org/actions/checkout@v4
 
-      - name: Set up PHP
-        uses: https://github.com/shivammathur/setup-php@v2
-        with:
-          php-version: '8.3'
-          extensions: pdo_sqlite, mbstring, xml, dom
-          coverage: none
-
       - name: Cache Composer dependencies
         uses: https://data.forgejo.org/actions/cache@v4
         with:

.forgejo/workflows/images.yml

@@ -0,0 +1,44 @@
+name: Build and Push Base Images
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'docker/build/**'
+      - '.forgejo/workflows/images.yml'
+  workflow_dispatch:
+
+jobs:
+  images:
+    runs-on: docker
+    container:
+      image: catthehacker/ubuntu:act-latest
+    strategy:
+      matrix:
+        include:
+          - name: fedi-feed-router-base
+            file: docker/build/Dockerfile.base
+          - name: fedi-feed-router-ci
+            file: docker/build/Dockerfile.ci
+    steps:
+      - uses: https://data.forgejo.org/actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: https://data.forgejo.org/docker/setup-buildx-action@v3
+
+      - name: Login to Forgejo Registry
+        uses: https://data.forgejo.org/docker/login-action@v3
+        with:
+          registry: forge.lvl0.xyz
+          username: ${{ github.actor }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Build and push
+        uses: https://data.forgejo.org/docker/build-push-action@v5
+        with:
+          context: .
+          file: ${{ matrix.file }}
+          push: true
+          tags: |
+            forge.lvl0.xyz/lvl0/${{ matrix.name }}:latest
+            forge.lvl0.xyz/lvl0/${{ matrix.name }}:${{ github.sha }}

docker/build/Dockerfile.ci

@@ -0,0 +1,25 @@
+# Image for CI: PHP and Composer only, no runtime server or frontend toolchain.
+# Tests run against sqlite in memory (see .env.testing), so no database client
+# or cache extension is needed.
+#
+# Extensions here are the ext-* requirements from composer.lock that php:alpine
+# does not already bundle. Regenerate that list before changing this file.
+FROM php:8.3-alpine
+
+COPY --from=mlocati/php-extension-installer:2 /usr/bin/install-php-extensions /usr/local/bin/
+
+RUN install-php-extensions \
+    pdo_sqlite \
+    mbstring \
+    dom \
+    xml \
+    fileinfo \
+    iconv \
+    pcntl \
+    posix
+
+# nodejs is not used by the app's tests; the Forgejo/GitHub JavaScript actions
+# (checkout, cache) are executed with it inside this container.
+RUN apk add --no-cache git unzip nodejs
+
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer