Removed verbosity setters

Tossing in the permissive MIT license

Simplifying packages / tasks

Ignore unknown hosts before pushing code to mirror

Simplying use cases to push all branches to remote

Use more standard show-current to get git branch

Using HOME env var instead of tilde to avoid non-expanding usage

Updated secret and SSH key path to the default id_rsa

Added target repo var to environment list

Exporting variables for usage in later commands

Renamed to .build.yml adoy

Fixed to not use mirror flag but remote/branch spec

Initial commit of example SourceHut -> GitHub git mirroring