Merge pull request #13 from OpenIPC/ci-docker-skip-without-secrets #3

	name: ci
	on:
	push:
	branches:
	- master
	workflow_dispatch:
	jobs:
	docker:
	runs-on: ubuntu-latest
	# Publish only from master, even for manual workflow_dispatch runs, so a
	# dispatch from a feature branch can't overwrite the :latest image.
	if: github.ref == 'refs/heads/master'
	steps:
	# Without DockerHub credentials the publish can't run; skip it (and keep
	# the job green) instead of failing every push to master. The secrets are
	# scoped to this step only (the login action takes them via its inputs).
	- name: Check DockerHub credentials
	id: creds
	env:
	DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
	DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
	run: \|
	if [ -n "$DOCKERHUB_USERNAME" ] && [ -n "$DOCKERHUB_TOKEN" ]; then
	echo "present=true" >> "$GITHUB_OUTPUT"
	else
	echo "present=false" >> "$GITHUB_OUTPUT"
	echo "::notice::DOCKERHUB_USERNAME/DOCKERHUB_TOKEN are not set; skipping the image publish."
	fi
	- name: Set up QEMU
	if: steps.creds.outputs.present == 'true'
	uses: docker/setup-qemu-action@v1
	- name: Set up Docker Buildx
	if: steps.creds.outputs.present == 'true'
	uses: docker/setup-buildx-action@v1
	- name: Login to DockerHub
	if: steps.creds.outputs.present == 'true'
	uses: docker/login-action@v1
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}
	- name: Build and push
	if: steps.creds.outputs.present == 'true'
	uses: docker/build-push-action@v2
	with:
	push: true
	tags: braunbearded/python-dvr:latest,braunbearded/python-dvr:${{ github.sha }}

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