Add CONTRIBUTING guide, DCO check, and drop private repo references #8

	name: Container

	# Builds the Kolla-style image (docker/Dockerfile) and pushes it to
	# GHCR. Tags: the git tag for releases, "main" for branch pushes; each
	# also gets a "-<kolla base tag>" suffixed variant so the OpenStack
	# release the image was built against is explicit.

	on:
	push:
	branches: [main]
	tags: ["v*"]

	env:
	BASE_TAG: 2025.1-ubuntu-noble

	jobs:
	image:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	steps:
	- uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
	with:
	# setuptools-scm derives the version from git history
	fetch-depth: 0
	- uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
	with:
	python-version: "3.12"
	# The Dockerfile installs the wheel from dist/
	- run: pip install build
	- run: python -m build
	- uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051 # v5
	id: meta
	with:
	images: ghcr.io/${{ github.repository }}
	tags: \|
	type=ref,event=branch
	type=ref,event=tag
	type=ref,event=branch,suffix=-${{ env.BASE_TAG }}
	type=ref,event=tag,suffix=-${{ env.BASE_TAG }}
	- uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6
	with:
	context: .
	file: docker/Dockerfile
	build-args: \|
	BASE_TAG=${{ env.BASE_TAG }}
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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