- Only build if the hash has changed. Previosuly
we'd unconditionally build and not push of the tag existed.
- Add '.m' to the hash if the repository is dirty.
This allows developers to build locally without committing
but makes it clear that the hash is from a modified repository.
- Don't push to hub if the repository is dirty
- If the current commit has a tag, also push this to hub.
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
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