Change to using setuptools_scm and git tagging for versioning. #30

	name: CI

	"on":
	push:
	tags:
	- "*"
	pull_request: {}

	jobs:
	build:

	runs-on: ubuntu-latest

	# Only do Docker builds of tagged releases.
	if: >
	startsWith(github.ref, 'refs/tags/')
	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- name: Define the Docker tag
	id: vars
	run: \|
	echo GITHUB_REF: $GITHUB_REF
	echo GITHUB_HEAD_REF: $GITHUB_HEAD_REF
	echo ::set-output name=tag::$(bin/docker-tag.sh)

	- name: Print the tag
	id: print
	run: echo ${{ steps.vars.outputs.tag }}

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

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

	- name: Build and push
	uses: docker/build-push-action@v4
	with:
	context: .
	push: true
	tags: \|
	ghcr.io/erykoff/redmapper:${{ steps.vars.outputs.tag }}
	cache-from: type=gha
	cache-to: type=gha,mode=max

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