github-actions: minimal check that Pythran works

Author: paugier

.github/minimal_pythran.py

@@ -0,0 +1,5 @@
+
+# pythran export func(int)
+
+def func(arg):
+    return arg

.github/workflows/ci-windows.yml

@@ -17,9 +17,23 @@ jobs:
       with:
         pixi-version: v0.47.0
         cache: false
-    - name: Tests
+
+    - name: Setup
       run: |
         pixi run install-editable
+        pixi list
+
+    - name: Checks
+      run: |
+        echo $CC
+        echo $CXX
+
+    - name: Minimal Pythran check
+      run: |
+        pixi run pythran .github/minimal_pythran.py
+
+    - name: Tests
+      run: |
         pixi run pytest tests
         pixi run mpirun -np 2 pytest tests
         echo "TRANSONIC_BACKEND=python" >> $GITHUB_ENV