feat: Migrate and delete solutions #6

	name: Publish prerelease

	# Since the action `salsify/action-detect-and-tag-new-version` does not work
	# in a pull request (see
	# https://github.com/salsify/action-detect-and-tag-new-version/issues/6) this
	# action publishes a docker container whenever one pushes to a branch name which
	# starts with `prerelease`. Thus this is an easy way to publish prerelease.
	#
	# TODO: Remove duplicate code from copy and pasting `docker.yml`
	on:
	push:
	branches:
	- prerelease**

	jobs:
	push-prerelease:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: google-github-actions/auth@v1
	with:
	credentials_json: '${{ secrets.GCP_KEY_CONTAINER_REGISTRY }}'
	- uses: google-github-actions/setup-gcloud@v1
	- run: gcloud auth configure-docker
	- uses: docker/build-push-action@v5
	with:
	push: true
	file: ./Dockerfile
	tags: eu.gcr.io/serlo-shared/serlo-mysql-database:${{ github.ref_name }}
	- name: Test for mysql in the serlo-mysql-database image
	run:
	docker run --entrypoint='' --rm eu.gcr.io/serlo-shared/serlo-mysql-database:${{ github.ref_name }} mysql --version

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