Moved builds to single workflow.

Fixed push manifest.

Add both images to manifest.

Fix manifest push.

Added arm64v8 build on self-hosted runner.

Build only amd64 on github.

Build arm64 without cache.

Add build for arm64v8.

Disable workflow for PRs.

Remove cruft.

Create Dependabot config file

Checkout code.

More verbose.

Check where we're running.

Make targets phony.