run some tests in devmode

uncovers some malloc issues

Author: minrk

.github/workflows/test.yml

@@ -92,6 +92,8 @@ jobs:
 
           - os: ubuntu-24.04
             python: "3.13"
+            env: |
+              PYTHONDEVMODE=1
 
           - os: ubuntu-24.04
             python: "3.13"
@@ -134,6 +136,11 @@ jobs:
           check-latest: ${{ matrix.python == '3.14' }}
           cache: pip
 
+      - name: set environment variables
+        if: ${{ matrix.env }}
+        run: |
+          echo "${{ matrix.env }}" >> "$GITHUB_ENV"
+
       - name: setup free threading
         if: ${{ matrix.free_threading }}
         run: |