Change Details

WIP

* image-name -> change the default to the tool/user running the cli (that is, the user triggering the build, or the tool triggering the build, that is, the uid, `os.getusername()` might be enough), make it optional to override. * dest-repository -> change the default to the tools instance (harbor.tools.wmflabs.org), make it optional to override. The code to modify for this is the decorators here: https://gerrit.wikimedia.org/r/plugins/gitiles/cloud/toolforge/toolforge-cli/+/refs/heads/main/toolforge_cli/cli.py#238