Signing is not setup for these repositories. It seems they haven't been updated
since before trust was added since their previous Makefile metadata (which was
translated in build.yml) did not contain `NOTRUST=1`.
Signed-off-by: Ian Campbell <ijc@docker.com>
tools/alpine and tools/guestfs are omitted since they do not currently use
pkg/package.mk and do their own thing. Slightly hacky arrangements are made for
these. Note that previously they were only recursed into for their default
target (push) and that behaviour is retained.
Signed-off-by: Ian Campbell <ijc@docker.com>
