Don't trigger CI when pushing branches (#240)

This commit stops triggering BK from triggering CI when branches get
pushed. We rely on CI for PRs, instead, which is handled by the BK PR
Bot.

(cherry picked from commit 63aa130)

Author: dliappis

catalog-info.yaml

@@ -58,7 +58,7 @@ spec:
       provider_settings:
         build_pull_requests: true
         build_pull_request_forks: false
-        build_branches: true
+        build_branches: false
         build_tags: false
         filter_enabled: true
         filter_condition: >-