Fix YAML syntax in 'on' section for proper CI trigger

Author: higakikeita

.github/workflows/sysdig-scan.yml

@@ -4,9 +4,11 @@ on:
   pull_request:
     branches:
       - main
+      - ci/sysdig-integration
   push:
     branches:
       - main
+      - ci/sysdig-integration
 
 jobs:
   scan:
@@ -39,4 +41,4 @@ jobs:
           -v ${{ github.workspace }}:/iac \
           quay.io/sysdig/sysdig-cli-scanner:latest \
           --apiurl ${{ secrets.SYSDIG_API_URL }} \
-          --iac scan /iac/k8s-specifications
+          --iac scan /iac/k8s-specifications