Add --with-repo to allow prebuilt stuff

Generalize --copr-assume-built to --assume-built

Reformat

More extensive use of shell.rs

Update README.md for new CLI subcommand structure

Add CLI subcommands: build and clean docker

Fix Docker image tagging to use proper repository:tag format

Fix for not having createrepo_c in the base container

Move createrepo_c to Docker RUN stage for better caching

Support more container versions

Support 'network' option for build, on whether internet access is allowed

Allow specifying git revision instead always using HEAD

Update To Do

Support global replacement in spec

Support spaces in rpmbuild args