Update gh action

.github/workflows/python-actions.yaml

@@ -12,17 +12,10 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: 3.9
-    - name: Check out nomad
-      uses: actions/checkout@v3
-      with:
-        repository: nomad-coe/nomad
-        path: nomad
-        submodules: true
     - name: Install dependencies
       run: |
         pip install --upgrade pip
-        pip install .[tests]
-        pip install ./nomad[parsing,infrastructure]
+        pip install .[tests] --index-url https://gitlab.mpcdf.mpg.de/api/v4/projects/2187/packages/pypi/simple
         pip install types-PyYAML
     - name: pycodestyle
       run: |