Add Dockerfile and build actions

Author: rnestler

.github/workflows/docker-build.yml

@@ -0,0 +1,15 @@
+name: Docker build
+
+on:
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-24.04
+    env:
+      DOCKER_REPO: ghcr.io/${{ github.repository }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build Docker image
+        run: RUBY_VERSION=3.3.4 NODE_VERSION=22.16.0 ./build.sh

Dockerfile

@@ -0,0 +1,18 @@
+# This Dockerfile is designed for running the CI of Ruby on Rails projects
+ARG RUBY_VERSION=3.4.4
+FROM docker.io/library/ruby:$RUBY_VERSION
+
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y postgresql-client libjemalloc2  && \
+    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+
+# Install yarn and node
+ARG NODE_VERSION=22.14.0
+ARG YARN_VERSION=1.22.22
+ENV PATH=/usr/local/node/bin:$PATH
+RUN curl -sL https://github.com/nodenv/node-build/archive/master.tar.gz | tar xz -C /tmp/ && \
+    /tmp/node-build-master/bin/node-build "${NODE_VERSION}" /usr/local/node && \
+    npm install -g yarn@$YARN_VERSION && \
+    rm -rf /tmp/node-build-master
+
+ENV RAILS_ENV="test"

build.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -euo pipefail
+
+if [ -z "${RUBY_VERSION:-}" ]; then
+  echo "RUBY_VERSION is not set"
+  exit 1
+fi
+
+if [ -z "${NODE_VERSION:-}" ]; then
+  echo "NODE_VERSION is not set"
+  exit 1
+fi
+
+docker build -t "${DOCKER_REPO}:ruby-${RUBY_VERSION}-node-${NODE_VERSION}" .