CI: also test against GAP 4.15

fingolfin · fingolfin · commit a8518af74131 · 2025-10-16T10:47:43.000+02:00
diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
@@ -17,6 +17,7 @@ jobs:
       matrix:
         gap-branch:
           - master
+          - stable-4.15
           - stable-4.14
           - stable-4.13
           - stable-4.12
