allow multiple branches in plugin test CI/CD

.github/workflows/plugin_test.yaml

@@ -22,19 +22,25 @@ jobs:
         include:
 
           - plugin: pynxtools-ellips
-            branch: main
+            branches:
+              - main
             tests_to_run: tests/.
           - plugin: pynxtools-raman
-            branch: main
+            branches:
+              - main
             tests_to_run: tests/.
           - plugin: pynxtools-mpes
-            branch: main
+            branches:
+              - main
             tests_to_run: tests/.
           - plugin: pynxtools-stm
-            branch: main
+            branches:
+              - main
             tests_to_run: tests/.
           - plugin: pynxtools-xps
-            branch: main
+            branches:
+              - update-configs-after-mpes-changes
+              - main
             tests_to_run: tests/.
           # - plugin: pynxtools-apm
           #   branch: main
@@ -61,13 +67,30 @@ jobs:
       - name: Install package
         run: |
           uv pip install ".[dev]"
+      - name: Check if branch exists
+        id: check-branch
+        run: |
+          branch_exists=false
+          for branch in ${{ matrix.branches }}; do
+            if git ls-remote --heads https://github.com/FAIRmat-NFDI/${{ matrix.plugin }}.git $branch | grep $branch; then
+              echo "Branch $branch exists."
+              echo "::set-output name=branch::$branch"
+              branch_exists=true
+              break
+            fi
+          done
+          if [ "$branch_exists" = "false" ]; then
+            echo "No branches exist."
+            exit 1
+          fi
       - name: Clone ${{ matrix.plugin }} repo
+        if: success()
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
           repository: FAIRmat-NFDI/${{ matrix.plugin }}
           path: ${{ matrix.plugin }}
-          ref: ${{ matrix.branch }}
+          ref: ${{ steps.check-branch.outputs.branch }}
       - name: Install nomad
         run: |
           uv pip install nomad-lab@git+https://gitlab.mpcdf.mpg.de/nomad-lab/nomad-FAIR.git