Implement a GitHub workflow to automatically run add_license.py

.github/workflows/add-license.yml

@@ -0,0 +1,44 @@
+name: Add License
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  add-license:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+          fetch-depth: 0 # Required to retrieve full commit history
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.12"
+
+    - name: Add License
+      run: |
+        python scripts/add_license.py
+
+    - name: Check for file changes
+      id: changes
+      run: |
+        if [ -n "$(git status --porcelain)" ]; then
+          echo "::set-output name=changes::true"
+        else
+          echo "::set-output name=changes::false"
+        fi
+
+    - name: Commit changes
+      if: steps.changes.outputs.changes == true
+      run: |
+        git config --global user.name "GitHub Actions Bot"
+        git config --global user.email "[email protected]"
+        git add .
+        git commit -m "Add license to files"
+        git push