Get the right standalone suffix when PR on a "maint/update_code_for_*" branch

Signed-off-by: paul.profizi <[email protected]>

Author: PProfizi

.github/workflows/ci.yml

@@ -50,11 +50,15 @@ jobs:
         elif ${{ github.event_name == 'pull_request' }}; then
           # If the PR is server-sync then extract suffix from branch name
           sub='maint/update_code_for_'
-          if [[ "${{ github.head_ref  }}" == *"$sub"* ]]; then
+          if [[ "${{ github.head_ref  }}" == *"$sub"*]]; then
             ref_name=${{ github.head_ref }}
             base_ref=${{ github.base_ref }}
             suffix=${ref_name/$sub[0-9][0-9][0-9]/''}
             suffix=${suffix/_on_$base_ref/''}
+          elif [["${{ github.base_ref  }}" == *"$sub"*]]; then
+            base_ref=${{ github.base_ref }}
+            suffix=${base_ref/$sub[0-9][0-9][0-9]/''}
+            suffix=${suffix/_on_*/''}
           fi
           echo "suffix=$suffix" >> "$GITHUB_OUTPUT"
         fi