Fix tag names for custom docker images.
Ensures the filenames in custom docker image tags are valid docker tag
characters. This requires the following:
lowercase ASCII letters
digits
a period
1-2 underscores
1 or more hyphens (dashes)
@@ -19,6 +19,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
### Fixed
+- #895 - convert filenames in docker tags to ASCII lowercase and ignore invalid characters
- #885 - handle symlinks when using remote docker.
- #868 - ignore the `CARGO` environment variable.
- #867 - fixed parsing of `build.env.passthrough` config values.
