17 - Add custom CI image build with PHP 8.4

.forgejo/ci/Dockerfile

@@ -0,0 +1,22 @@
+# CI image: catthehacker/ubuntu:act-latest + PHP 8.4 + extensions + Composer
+# Used by .forgejo/workflows/ci.yml — built/pushed by .forgejo/workflows/ci-image.yml
+FROM catthehacker/ubuntu:act-latest
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN add-apt-repository -y ppa:ondrej/php \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+        php8.4-cli \
+        php8.4-pgsql \
+        php8.4-mbstring \
+        php8.4-xml \
+        php8.4-dom \
+        php8.4-intl \
+        php8.4-pcov \
+    && update-alternatives --set php /usr/bin/php8.4 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Composer (latest 2.x, static binary from official image)
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer

.forgejo/workflows/ci-image.yml

@@ -0,0 +1,40 @@
+name: Build CI Image
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - '.forgejo/ci/Dockerfile'
+      - '.forgejo/workflows/ci-image.yml'
+  pull_request:
+    paths:
+      - '.forgejo/ci/Dockerfile'
+      - '.forgejo/workflows/ci-image.yml'
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: catthehacker/ubuntu:act-latest
+
+    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: .forgejo/ci
+          file: .forgejo/ci/Dockerfile
+          platforms: linux/amd64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: forge.lvl0.xyz/lvl0/rater-ci:latest