Improve Private Cloud Image build

Look into using private pypi repo or just adding dependencies on a github repository directly. Preferred approach would be to use poetry optional groups.

Tasks:

- [ ] Have a private protected PyPI instance running.
- [ ] Have private releases set up for the SAML package.
- [ ] Have private releases set up for the Workflows package.
- [ ] Have private releases set up for the Auth Controller package.
- [ ] Have private releases set up for the RBAC package.
- [ ] Add a Poetry optional group and replace the manual integration to a `make install` invocation in .github/actions/api-deploy-ecs/action.yml.