Support Helm images with colons

[jabdoa2]

Tags in images (e.g. registry.tld/path/image:1) do not work in tilt. It will complain that image registry.tld/path/image is not used in any resource. Even if I run: docker_build("registry.tld/path/image:1", ".")`. This is a show stopper for us because we would have to change all helm charts to use it.

[nicks]

sorry you ran into this! we're working on making this better.

You can keep the show going right now by just dropping the tag in the docker_build call. Tilt ignores the tag anyway. i.e.,

docker_build("registry.tld/path/image", ".")

@dougsparling also ran into this and has an open PR so that it doesn't fail so cryptically: #1047