feat: docker multi-arch composite actions #1347
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…d docker-import-digests-push-manifest
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This pull request introduces three new composite actions that (together) perform multi-arch docker builds using Grafana's self-hosted runners:
docker-build-push-image: Intended to replacebuild-push-to-dockerhubandpush-to-gar-docker, this handles building and pushing Docker images to both Google Artifact Registry and DockerHub. The action is highly configurable, supports multi-arch builds, and is designed to be extensible for additional registries.docker-export-digest: For Docker multi-arch builds, exports a Docker image digest as a job artifact.docker-import-digests-push-manifest: For Docker multi-arch builds, imports Docker digests from the previous action, and composes and pushes a manifest.Related to #1348.
Part of https://github.com/grafana/deployment_tools/issues/320068