Get max height from snapshot and enable build cache #4

	name: build

	on:
	push:
	branches:
	- main
	tags:
	- v*
	pull_request:

	jobs:
	docker:
	runs-on: ubuntu-latest
	env:
	IMAGE: ghcr.io/${{ github.repository_owner }}/zetacored
	steps:
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3

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

	- name: Login to GHCR
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Generate version
	run: \|
	# Default tag as commit SHA
	VERSION=${GITHUB_SHA::7}

	# Use tag name if it's a tag push
	if [ "$GITHUB_EVENT_NAME" == "push" ] && [ "$GITHUB_REF_TYPE" == "tag" ]; then
	VERSION=${GITHUB_REF_NAME}
	fi

	echo "VERSION=$VERSION" >> $GITHUB_ENV

	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	platforms: linux/amd64,linux/arm64
	push: true
	provenance: mode=max
	tags: "${{ env.IMAGE }}:${{ env.VERSION }}"
	cache-from: type=registry,ref=${{ env.IMAGE }}:buildcache
	cache-to: type=registry,ref=${{ env.IMAGE }}:buildcache,mode=max

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