If you'd like to run devenv as a workflow create .github/workflows/test.yml:

name: "Test"

on:
  pull_request:
  push:

jobs:
  tests:
    strategy:
      matrix:
        os: [ubuntu-latest, macos-latest]
    runs-on: ${{ matrix.os }}
    steps:
    - uses: actions/[email protected]
    - uses: cachix/[email protected]
    - uses: cachix/[email protected]
      with:
        name: devenv
    - name: Install devenv.sh
      run: nix profile install github:cachix/devenv/latest
      shell: sh
    - run: devenv ci
    - run: devenv shell echo ok