Tagged releases: docker exporter does not currently support exporting manifest lists

[rjhenry]

As it stands, actions runs for tagged releases fails:

Buildx version
  /usr/bin/docker buildx version
  github.com/docker/buildx 0.9.1+azure-1 ed00243a0ce2a0aee75311b06e32d33b44729689
/usr/bin/docker buildx build --cache-from type=registry,ref=solidnerd/bookstack-dev:master --file ./Dockerfile --iidfile /tmp/docker-build-push-oLAtK3/iidfile --label org.opencontainers.image.title=docker-bookstack --label org.opencontainers.image.description=BookStack in a container --label org.opencontainers.image.url=https://github.com/solidnerd/docker-bookstack --label org.opencontainers.image.source=https://github.com/solidnerd/docker-bookstack --label org.opencontainers.image.version=sha-aec8ef7 --label org.opencontainers.image.created=2022-09-12T09:49:29.214Z --label org.opencontainers.image.revision=aec8ef7de11102596a9a6844d9adb42e1721591a --label org.opencontainers.image.licenses=MIT --output type=docker,dest=/tmp/image-bookstack.tar --platform linux/amd64,linux/arm64 --tag solidnerd/bookstack-dev:sha-aec8ef7 --metadata-file /tmp/docker-build-push-oLAtK3/metadata-file .
ERROR: docker exporter does not currently support exporting manifest lists
Error: buildx failed with: ERROR: docker exporter does not currently support exporting manifest lists

This means no image bumps will make it to to registry, so images are falling behind.

[rjhenry]

@rounakdatta This appears to be caused by the changes introduced in #321, so I'm going to revert those to allow releases to continue. If you'd like to tweak how your PR works, I'd be happy to re-review at a later date.

[stale]

This issue has been automatically marked as stale because it has not had any activity for the last 30 days. It will be closed if no further activity occurs during the next 7 days. Thank you for your contributions.

[rjhenry]

Seems to be working just fine now, so tentatively closing this.