[v8.3.x] Build: Correct syntax for directing release builds (#42942)

* Build: don't run release builds on grafana/grafana repo (#42785)

(cherry picked from commit b6818718e9)

* Build: Correct syntax for directing release builds (#42789)

(cherry picked from commit 6a5416bcec)

Co-authored-by: malcolmholmes <42545407+malcolmholmes@users.noreply.github.com>

scripts/drone/pipelines/release.star

@@ -240,6 +240,9 @@ def release_pipelines(ver_mode='release', trigger=None):
     if not trigger:
         trigger = {
             'ref': ['refs/tags/v*',],
+            'repo': {
+              'exclude': ['grafana/grafana'],
+            },
         }
 
     should_publish = ver_mode in ('release', 'test-release',)