Python headers

Author: DimitriPapadopoulos

.github/workflows/ci.yaml

@@ -41,6 +41,12 @@ jobs:
         if: matrix.platform == 'macos-15-large'
         run: conda install -y 'clang>=12.0.1,<17'
 
+      - name: Python headers
+        if: startsWith(matrix.platform, 'ubuntu')
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y python3.12-dev
+
       - name: Show conda environment info
         run: |
           conda info