Add GitHub Actions workflow for citation metadata update

Author: sformel

.github/workflows/generate_citation_metadata.yml

@@ -0,0 +1,36 @@
+name: Update Zenodo and Citation Metadata
+
+on:
+  push:
+    paths:
+      - 'contributors.yaml'
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  update-metadata:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+      
+      - name: Install dependencies
+        run: |
+          pip install pyyaml
+      
+      - name: Generate zenodo.json and CITATION.cff
+        run: |
+          python scripts/generate_zenodo.py
+      
+      - name: Commit changes
+        run: |
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "github-actions[bot]"
+          git add .zenodo.json CITATION.cff
+          git diff --quiet && git diff --staged --quiet || git commit -m "Update zenodo.json and CITATION.cff from contributors.yaml"
+          git push