Reduce conformance test run frequency.

Run conformance tests against master every 8 hours instead of 30 minutes.

Signed-off-by: Bernd Verst <4535280+berndverst@users.noreply.github.com>

.github/workflows/conformance.yml

@@ -18,7 +18,7 @@ on:
     types: [conformance-test]
   workflow_dispatch:
   schedule:
-    - cron: '*/30 * * * *'
+    - cron: '0 */8 * * *'
   pull_request:
     branches:
       - master