Added Debian build.

.github/workflows/build image.yaml

@@ -28,7 +28,7 @@ jobs:
         run: image=${GITHUB_REPOSITORY,,} && >>"$GITHUB_ENV" echo image=${image%-*}
 
       - name: Build Docker image
-        run: docker build --tag ${{ env.registry }}/${{ env.image }} .
+        run: docker build --tag ${{ env.registry }}/${{ env.image }} - <Debian.Dockerfile
 
       - name: Push Docker image
-        run: docker push ${{ env.registry }}/${{ env.image }}
+        run: docker push ${{ env.registry }}/${{ env.image }}:debian

Debian.Dockerfile

@@ -0,0 +1,27 @@
+FROM php:8.2.12-fpm
+
+RUN apt-get update && \
+    apt-get --assume-yes install libicu-dev libxslt1-dev libffi-dev libpq-dev libgmp-dev \
+    && docker-php-ext-install opcache \
+        # Number formatting in our own application templates requires intl.
+        intl \
+        # symfony/messenger requires PCNTL for graceful shutdown of queue workers.
+        pcntl \
+        # Pheanstalk requires sockets extension otherwise it throws SocketException with "Unknown error" (CLUB-250-B6).
+        sockets \
+        # lorenzo/pinky requires XSL extension.
+        xsl \
+        # amphp/hpack can benefit from FFI extension.
+        ffi \
+        # amphp/postgres requires either pecl-pq or ext-pgsql.
+        pgsql \
+        # Phinx requires pdo_pgsql extension.
+        pdo_pgsql \
+        # xpaw/steamid requires GMP extension.
+        gmp \
+    # All dev packages can be removed post-compile, however the main packages cannot.
+    && apt-get purge libicu-dev libxslt1-dev libffi-dev libpq-dev libgmp-dev
+
+# Install Composer.
+RUN wget https://raw.githubusercontent.com/composer/getcomposer.org/main/web/installer -qO- |\
+    php -- --install-dir /usr/local/bin --filename composer