runtime-matrix is on parity default too

Author: x3c41a

.github/workflows/integration-test.yml

@@ -22,7 +22,7 @@ env:
 jobs:
   # This generates a matrix with all the required runtimes which will be run in the next step
   runtime-matrix:
-    runs-on: ubuntu-latest
+    runs-on: parity-default
     outputs:
       runtime: ${{ steps.runtime.outputs.runtime }}
     name: Extract runtimes from matrix