Build and publish docker container in GitHub Actions

.github/workflows/docker-build.yml

@@ -0,0 +1,14 @@
+name: Docker build
+
+on: [push]
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-24.04
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build Docker image
+        run: docker build -t "${REGISTRY}/${IMAGE_NAME}" .

.github/workflows/docker-publish.yml

@@ -0,0 +1,24 @@
+name: Docker Publish
+
+on:
+  push:
+    branches: ["main"]
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-24.04
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build Docker image
+        run: docker build -t "${REGISTRY}/${IMAGE_NAME}:main" .
+      - name: Push Docker image
+        run: docker push "${REGISTRY}/${IMAGE_NAME}:main"

Dockerfile

@@ -2,7 +2,7 @@
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
 ARG RUBY_VERSION=3.3.6
-FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
+FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim AS base
 
 # Rails app lives here
 WORKDIR /rails
@@ -14,7 +14,7 @@ ENV RAILS_ENV="production" \
     BUNDLE_WITHOUT="development"
 
 # Throw-away build stage to reduce size of final image
-FROM base as build
+FROM base AS build
 
 # Install packages needed to build gems
 RUN apt-get update -qq && \

Gemfile.lock

@@ -475,7 +475,7 @@ DEPENDENCIES
   webmock
 
 RUBY VERSION
-   ruby 3.3.4p94
+   ruby 3.3.6p108
 
 BUNDLED WITH
    2.5.14