Docker image is missing the git command #59
Description
Issue
While investigating #58, it was discovered that the Docker image does not contain the git command. PyTerraBackTYL uses the the GitPython package depends which depends on the locally installed version of git. This leaves the Git based backend fundamentally broken for users of the Docker image.
Why this happened
The Dockerfile underwent a large rewrite to minimize the image size. In that process, the steps required to install git were mistakenly omitted.
A more robust end-to-end testing of the Docker image in CI/CD would have caught this. This ticket is to re-introduce the steps to install the git command into the container.