fix(ci): only scan on master branch (datahub-project#7047)

.github/workflows/docker-unified.yml

@@ -88,6 +88,7 @@ jobs:
           file: ./docker/datahub-gms/Dockerfile
           platforms: linux/amd64,linux/arm64
   gms_scan:
+    if: github.ref_name == 'master'
     permissions:
       contents: read # for actions/checkout to fetch code
       security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
@@ -148,6 +149,7 @@ jobs:
           file: ./docker/datahub-mae-consumer/Dockerfile
           platforms: linux/amd64,linux/arm64
   mae_consumer_scan:
+    if: github.ref_name == 'master'
     name: "[Monitoring] Scan MAE consumer images for vulnerabilities"
     runs-on: ubuntu-latest
     needs: [setup, mae_consumer_build]
@@ -208,6 +210,7 @@ jobs:
           file: ./docker/datahub-mce-consumer/Dockerfile
           platforms: linux/amd64,linux/arm64
   mce_consumer_scan:
+    if: github.ref_name == 'master'
     name: "[Monitoring] Scan MCE consumer images for vulnerabilities"
     runs-on: ubuntu-latest
     needs: [setup, mce_consumer_build]
@@ -268,6 +271,7 @@ jobs:
           file: ./docker/datahub-upgrade/Dockerfile
           platforms: linux/amd64,linux/arm64
   datahub_upgrade_scan:
+    if: github.ref_name == 'master'
     name: "[Monitoring] Scan DataHub Upgrade images for vulnerabilities"
     runs-on: ubuntu-latest
     needs: [setup, datahub_upgrade_build]
@@ -327,6 +331,7 @@ jobs:
           file: ./docker/datahub-frontend/Dockerfile
           platforms: linux/amd64,linux/arm64
   frontend_scan:
+    if: github.ref_name == 'master'
     name: "[Monitoring] Scan Frontend images for vulnerabilities"
     runs-on: ubuntu-latest
     needs: [setup, frontend_build]