ci: build container without pushing on PRs against main #30

	name: "Build Django image"

	concurrency:
	group: ${{ github.ref }}
	cancel-in-progress: true

	on:
	push:
	branches:
	- "main"
	pull_request:
	branches:
	- "main"
	workflow_dispatch:

	permissions:
	contents: read
	packages: write

	jobs:
	build-push:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2

	- name: Login to GitHub Container Registry
	uses: docker/login-action@v2
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ github.token }}

	- name: Set REGISTRY env variable
	run: echo "REGISTRY=ghcr.io/$(echo ${{ github.repository }} \| tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV

	- name: Build container image
	uses: docker/build-push-action@v4
	id: build-image
	with:
	context: ./.
	file: ./Dockerfile
	push: ${{ github.event_name != 'pull_request' }}
	tags: ${{env.REGISTRY}}:${{github.run_number}}, ${{env.REGISTRY}}:latest
	cache-from: type=gha
	cache-to: type=gha,mode=max

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