Only upload builder artifacts from workflow runs triggered after merge #31

	name: Generate ubuntu-2004 images

	env:
	GITHUB_OUTPUT: ""

	on:
	push:
	branches:
	- main
	paths:
	- "docker/ubuntu-2004-builder.Dockerfile"
	- ".github/workflows/ubuntu-2004.yml"
	pull_request:
	types: [opened, synchronize, reopened]
	paths:
	- "docker/ubuntu-2004-builder.Dockerfile"
	- ".github/workflows/ubuntu-2004.yml"

	jobs:
	ubuntu-2004-builder:
	name: psibase-builder-ubuntu-2004
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v3
	with:
	submodules: false
	fetch-depth: 0

	- name: Preparation
	id: prep
	run: \|
	REGISTRY="ghcr.io"
	IMAGE="${REGISTRY}/${{ github.repository_owner }}/psibase-builder-ubuntu-2004"
	TAGS="${IMAGE}:${{ github.sha }}"
	echo "tags=${TAGS,,}" >> $GITHUB_OUTPUT

	- name: Showtag
	id: showtag
	run: echo ${{ steps.prep.outputs.tags }}

	- name: Docker Buildx setup
	uses: docker/setup-buildx-action@v2
	with:
	buildkitd-flags: --debug

	- name: Login in to registry
	uses: docker/login-action@v2
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build & Publish Image
	uses: docker/build-push-action@v4
	with:
	context: .
	push: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
	file: docker/ubuntu-2004-builder.Dockerfile
	tags: ${{ steps.prep.outputs.tags }}
	platforms: linux/amd64
	outputs: type=image,annotation-index.org.opencontainers.image.description=Psibase build environment based on Ubuntu 20.04 (amd64)

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