Use ref_name if head_ref is not present (#348)

.github/workflows/nomad-requirements.yml

@@ -24,11 +24,11 @@ jobs:
       run: |
         git clone --depth 1 --branch develop --recurse-submodules https://gitlab.mpcdf.mpg.de/nomad-lab/nomad-FAIR.git nomad
         git submodule update --init --recursive --depth 1
-    
+
     - name: Replace pynxtools dependency in NOMAD pyproject.toml
       working-directory: ./nomad
       run: |
-        sed -i 's|pynxtools\[convert\]==[0-9]\+\(\.[0-9]\+\)\{0,2\}|pynxtools\[convert\]@git+https://github.com/FAIRmat-NFDI/pynxtools.git@${{ github.head_ref }}|' pyproject.toml
+        sed -i 's|pynxtools\[convert\]==[0-9]\+\(\.[0-9]\+\)\{0,2\}|pynxtools\[convert\]@git+https://github.com/FAIRmat-NFDI/pynxtools.git@${{ github.head_ref || github.ref_name }} |' pyproject.toml
 
     - name: Set up Python
       uses: actions/setup-python@v2
@@ -37,7 +37,7 @@ jobs:
 
     - name: Install uv
       run: |
-        curl -LsSf https://astral.sh/uv/install.sh | sh 
+        curl -LsSf https://astral.sh/uv/install.sh | sh
 
     - name: Generate (dev-)requirements.txt from modified pyproject.toml
       working-directory: ./nomad