Check if we need to build a new image due to base image update #22

	name: Check if we need to build a new image due to base image update
	on:
	schedule:
	- cron: "30 * * * *"
	workflow_dispatch:

	jobs:
	check:
	name: Check if there's a new version of the base image
	runs-on: ubuntu-latest
	outputs:
	needs_rebuild: ${{ steps.maybe-build.conclusion == 'success' }}
	steps:
	- name: Get SHA of the latest base image present in the repository
	id: registry
	run: \|
	REGISTRY_SHA=$(skopeo inspect --raw docker://ghcr.io/ublue-os/aurora-dx:stable \| jq '.config.digest')
	echo "SHA=$REGISTRY_SHA" >> $GITHUB_OUTPUT

	- name: Download artifact from the last successful build
	id: last-artifact
	uses: dawidd6/action-download-artifact@v6
	with:
	workflow: build.yaml
	workflow_search: false
	workflow_conclusion: success
	name: latest_base_image_sha
	if_no_artifact_found: ignore

	- name: Get SHA of the base image from the last successful build
	id: last-build
	if: steps.last-artifact.outputs.found_artifact == 'true'
	run: \|
	LAST_BUILD_SHA=$(cat latest_base_image_sha)
	echo "SHA=$LAST_BUILD_SHA" >> $GITHUB_OUTPUT

	- name: Decide that we need a new build
	id: maybe-build
	if: steps.last-build.outputs.SHA != steps.registry.outputs.SHA
	run: \|
	echo "aurora-dx:stable is currently at [${{ steps.registry.outputs.SHA }}]"
	echo "yaurora has last been built at aurora-dx:stable's: [${{ steps.last-build.outputs.SHA }}]"
	echo "Verdict: yaurora needs to be rebuilt"

	build:
	permissions:
	contents: read
	packages: write
	id-token: write
	name: Build Custom Image
	needs: check
	if: needs.check.outputs.needs_rebuild == 'true'
	uses: ./.github/workflows/build.yaml

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