Update alpine Docker tag to v3.20.3 #100

	on:
	push:
	branches:
	- "*"
	pull_request:
	merge_group:

	name: CI build
	jobs:
	build:
	name: CI build
	runs-on: ubuntu-latest
	env:
	# Use docker.io for Docker Hub if empty
	REGISTRY: ghcr.io
	# github.repository as <account>/<repo>
	IMAGE_NAME: ${{ github.repository }}
	permissions:
	contents: read
	packages: write
	steps:

	- name: Checkout repo
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: ^1.20

	- name: Build binaries
	run: go build -o rittal-exporter -ldflags "-s -w" -v .
	env:
	CGO_ENABLED: 0

	- name: Set up Docker Buildx
	id: buildx
	uses: docker/setup-buildx-action@v3
	- name: Log into registry ${{ env.REGISTRY }}
	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: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	tags: \|
	type=schedule
	type=ref,event=branch
	type=ref,event=tag
	type=ref,event=pr
	type=raw,value={{branch}}-{{sha}}-{{date 'X'}},enable=${{ github.event_name != 'pull_request' }}
	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	context: .
	push: ${{ github.event_name != 'pull_request' && github.event_name != 'merge_group' && github.actor != 'renovate[bot]'}}
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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