Add Docker multi-bot deployment flow #1

	name: Container Image

	on:
	push:
	branches: [master]
	tags:
	- "v*"
	- "..*"
	pull_request:
	branches: [master]
	workflow_dispatch:

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

	env:
	REGISTRY: ghcr.io

	jobs:
	docker:
	name: Build Container
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Compute image name
	id: prep
	shell: bash
	run: echo "image=${REGISTRY}/${GITHUB_REPOSITORY_OWNER,,}/discordmusicbot" >> "$GITHUB_OUTPUT"

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Log in to GHCR
	if: github.event_name != 'pull_request'
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract Docker metadata
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ steps.prep.outputs.image }}
	tags: \|
	type=ref,event=branch
	type=ref,event=pr
	type=sha,prefix=sha-
	type=semver,pattern={{version}}
	type=semver,pattern={{major}}.{{minor}}
	type=raw,value=latest,enable={{is_default_branch}}

	- name: Build and optionally push image
	uses: docker/build-push-action@v6
	with:
	context: .
	file: ./Dockerfile
	platforms: linux/amd64
	pull: true
	push: ${{ github.event_name != 'pull_request' }}
	provenance: false
	sbom: false
	cache-from: type=gha
	cache-to: type=gha,mode=max
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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