Enable build-time caching layers in Dockerfile to improve dependency … #5

	name: "Build and Push Multi-JDK Docker Image"

	on:
	push:
	branches: [main]
	tags: ["v*"]
	pull_request:
	branches: [main]

	env:
	REGISTRY: ghcr.io

	jobs:
	build:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	steps:
	- uses: actions/checkout@v6
	- name: "Set lowercase image name"
	run: echo "IMAGE_NAME=$(echo ${{ github.repository }} \| tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
	- uses: docker/setup-qemu-action@v3
	- uses: docker/setup-buildx-action@v3
	- name: "Log in to GHCR"
	if: github.event_name != 'pull_request'
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: "Docker meta"
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	tags: \|
	type=raw,value=latest,enable={{is_default_branch}}
	type=semver,pattern={{version}}
	type=sha
	- name: "Build and push"
	uses: docker/build-push-action@v6
	with:
	context: .
	platforms: linux/amd64,linux/arm64
	push: ${{ github.event_name != 'pull_request' }}
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}
	cache-from: type=gha
	cache-to: type=gha,mode=max
	load: ${{ github.event_name == 'pull_request' }}

	- name: "Smoke tests"
	run: \|
	set -euo pipefail
	image="${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}"
	for cmd in "java -version" "gradle --version" "node --version" "rg --version" "fd --version"; do
	echo "==> $cmd"
	docker run --rm "$image" bash -c "source /opt/sdkman/bin/sdkman-init.sh && $cmd"
	done

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