Use internal runners for nightly builds

because on the Github ones test was failing all the time, while it
worked locally.

Author: thardeck

.github/workflows/e2e-nightly-ci.yml

@@ -28,7 +28,7 @@ env:
 
 jobs:
   e2e-fleet-nightly-test:
-    runs-on: ubuntu-latest
+    runs-on: runs-on,runner=8cpu-linux-x64,mem=16,run-id=${{ github.run_id }}
 
     strategy:
       matrix: