Alpine dockerfile

Author: henrik242

.github/workflows/scheduled_jobs.yml

@@ -15,8 +15,13 @@ jobs:
         include:
           - ruby_version: "3.3"
             postgresql_version: 17
+            variant: slim
           - ruby_version: "3.3"
             postgresql_version: 18
+            variant: slim
+          - ruby_version: "3.3"
+            postgresql_version: 17
+            variant: alpine
     outputs:
       image_tag: ${{ steps.meta.outputs.tags }}
       image_sha: ${{ steps.docker_build.outputs.digest }}
@@ -54,7 +59,7 @@ jobs:
           images: |
             ghcr.io/${{ github.repository_owner }}/ruby-pg
           tags: |
-            type=raw,value=${{ matrix.ruby_version }}-pg${{ matrix.postgresql_version }}
+            type=raw,value=${{ matrix.ruby_version }}-pg${{ matrix.postgresql_version }}${{ matrix.variant == 'alpine' && '-alpine' || '' }}
 
       - name: Build and push Docker base image
         id: docker_build
@@ -65,6 +70,7 @@ jobs:
           push: ${{ github.ref == 'refs/heads/main' }} # Only push on main branch
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          file: ${{ matrix.variant == 'alpine' && 'Dockerfile.alpine' || 'Dockerfile' }}
           build-args: |
             RUBY_VERSION=${{ matrix.ruby_version }}
             POSTGRESQL_VERSION=${{ matrix.postgresql_version }}

Dockerfile.alpine

@@ -0,0 +1,32 @@
+ARG RUBY_VERSION=missing-build-arg
+FROM ruby:${RUBY_VERSION}-alpine
+
+ENV TZ=Etc/UTC \
+    LANG=C.UTF-8 \
+    BUNDLE_FORCE_RUBY_PLATFORM=true
+
+ARG POSTGRESQL_VERSION=missing-build-arg
+
+RUN set -eux && \
+    apk add --no-cache \
+      tzdata ca-certificates \
+      curl curl-dev \
+      git \
+      build-base \
+      pkgconf \
+      libxml2-dev zlib-dev \
+      geos geos-dev \
+      imagemagick \
+      libwebp-tools \
+      xz \
+      jemalloc \
+      gnupg \
+      rust cargo \
+      nodejs npm \
+      postgresql${POSTGRESQL_VERSION} && \
+    ln -snf "/usr/share/zoneinfo/$TZ" /etc/localtime && echo "$TZ" > /etc/timezone
+
+ENV LD_PRELOAD=/usr/lib/libjemalloc.so.2
+
+RUN gem update --system 3.4.22
+