Add separate GitHub Actions job for Cairo-dependent tests

Co-authored-by: csett86 <1392875+csett86@users.noreply.github.com>

Author: Copilot

.github/workflows/tests.yml

@@ -49,6 +49,26 @@ jobs:
       - name: Run tests with tox
         run: tox -e ${{ matrix.toxenv }}
 
+  test-cairo:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.12"
+          cache: 'pip'
+
+      - name: Install Cairo dependencies
+        run: sudo apt-get update && sudo apt-get install -y libcairo2-dev
+
+      - name: Install tox
+        run: pip install tox
+
+      - name: Run Cairo tests with tox
+        run: tox -e cairo
+
   build:
     runs-on: ubuntu-latest
     steps:
@@ -107,7 +127,7 @@ jobs:
 
   create-issue-on-failure:
     runs-on: ubuntu-latest
-    needs: [test, build, docs]
+    needs: [test, test-cairo, build, docs]
     if: always() && (contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')) && github.event_name == 'schedule'
     permissions:
       issues: write