[design] re-use GH actions templates

[gares]

It seems one can use a template GH action from another repo: https://docs.github.com/en/actions/how-tos/reuse-automations/reuse-workflows

What I really don't like of the nix CI is that:

• I have huge generated files committed in
• I have to run nix in order to update them (download stuff, install stuff...)
• modulo pinning, these files are the same on all my projects

I wonder if we could have these huge files part of this repo only, and reuse them from other projects. Example:

jobs:
  call-workflow-passing-data:
    uses: octo-org/example-repo/.github/workflows/reusable-workflow.yml@main
    with:
      config-path: .github/labeler.yml
    secrets:
      personal_access_token: ${{ secrets.token }}