Restrict issue creation for app distro gradle compat tests to daily check on main (#8261)

Co-authored-by: Chris Chestnut <cchestnut@google.com>

Author: MaesterChestnut

.github/workflows/app-distribution-gradle-compatibility-tests.yml

@@ -55,7 +55,7 @@ jobs:
           path: firebase-appdistribution-gradle/build/reports/tests/
 
       - name: Create GitHub Issue on Failure
-        if: failure()
+        if: failure() && github.event_name == 'schedule' && github.ref_name == 'main'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |