Don't run shiftleft on release branches

We require PRs for those branches so this is already checked in the branch before. The job fails on the release branch but worked in the PR so besides misleading this is also redundant.

Author: vmcj

.github/workflows/shiftleft.yml

@@ -2,6 +2,9 @@ name: SL Scan
 
 on:
   push:
+    branches-ignore:
+      - main
+      - '[0-9]+.[0-9]+'
 
 jobs:
   Scan-Build: