CI: E2E Test(s) to confirm init deployments properly create repos

[jtrrll]

Our ultimate test for init mimics how a user would interact with our application. Using GH actions, we should access our deployment, attempt to run the CLI, and confirm that a repo is correctly generated. This includes checking that the packages we specify are installed and accessible, as well as any files and folders are generated.

Ideally this test can be run locally, so bonus points for finding a way to do this with and without GH actions (maybe a shell script that GH actions calls)