feat!: add dedicated grove user

Description

This MR fixes mounting permission issues on Docker for Linux by creating a dedicated grove user in the container.

Supporting information

Testing instructions

Steps to test the changes on Linux:

1. checkout gabor/docker-permissions the grove directory of a cluster repo
2. go to control directory
3. run ./shell
4. validate that git status command works

Dependencies

N/A

Screenshots

N/A

Checklist

If any of the items below is not applicable, do not remove them, but put a check in it.

• All providers include the new feature/change
• All affected providers can provision new clusters
• Unit tests are added/updated
• Documentation is added/updated
• The TOOLS_CONTAINER_IMAGE_VERSION in ci_vars.yml is updated
• The grove-template repository is updated

Additional context

N/A