Generic Dockerfile for the new alpine repos

Author: andrius

.github/workflows/build.yml

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+name: Build and Push Docker Images
+
+on:
+  push:
+  workflow_dispatch:
+  # schedule:
+  #   - cron: '0 0 * * *' # runs every day at midnight
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        alpine_version:
+          - 2.7
+          - 3.1
+          - 3.2
+          - 3.3
+          - 3.4
+          - 3.5
+          - 3.6
+          - 3.7
+          - 3.8
+          - 3.9
+          - 3.10
+          - 3.11
+          - 3.12
+          - 3.13
+          - 3.14
+          - 3.15
+          - 3.16
+          - 3.17
+          - 3.18
+          - 3.19
+          - latest
+          - edge
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        run: docker login -u ${{ secrets.DOCKERHUB_USERNAME }} -p ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and Push Image
+        run: |
+          if [ -f "Dockerfile-${{ matrix.alpine_version }}" ]; then
+            DOCKERFILE=Dockerfile-${{ matrix.alpine_version }}
+          else
+            DOCKERFILE=Dockerfile
+          fi
+
+          docker buildx build \
+            --push \
+            --pull \
+            --quiet \
+            --platform linux/amd64,linux/arm64 \
+            --tag andrius/alpine-ruby:${{ matrix.alpine_version }} \
+            --build-arg ALPINE_VERSION=${{ matrix.alpine_version }} \
+            --file $DOCKERFILE
+            .

Dockerfile

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+# vim:set fenc=utf-8 ts=2 sw=2 sts=2 et ft=dockerfile:
+ARG ALPINE_VERSION
+FROM alpine:${ALPINE_VERSION}
+
+LABEL "org.opencontainers.image.authors"="Andrius Kairiukstis <[email protected]>"
+LABEL "org.opencontainers.image.source"="https://github.com/andrius/alpine-ruby"
+LABEL "org.opencontainers.image.description"="Minimal dockerized ruby based on alpine-linux"
+
+ENV NOKOGIRI_USE_SYSTEM_LIBRARIES=1
+
+ADD gemrc /root/.gemrc
+
+RUN apk update && apk add \
+  ruby \
+  ruby-etc \
+  ruby-bigdecimal \
+  ruby-io-console \
+  ruby-irb \
+  ca-certificates \
+  libressl \
+  less \
+  : \
+  && apk add --virtual .build-dependencies build-base ruby-dev libressl-dev \
+  && gem install bundler || apk add ruby-bundler \
+  && bundle config build.nokogiri --use-system-libraries \
+  && bundle config git.allow_insecure true \
+  && gem install json \
+  : \
+  && gem cleanup \
+  && apk del .build-dependencies \
+  && rm -rf /usr/lib/ruby/gems/*/cache/* /var/cache/apk/* /tmp/* /var/tmp/*