This is like the `push` target but omits the pulls and depends on forcetag
instead. With the git commit now being embedded into the image this is now a
necessary part of rebasing a PR for which images have already been pushed.
Also adds PHONY targets for existing forcetag and push targets which were
missing.
NB $(error) appends a "." to omit the final one from the error message
Signed-off-by: Ian Campbell <ijc@docker.com>
6c689a84dd