ci(gha): execute sast-snyx only on main branch

Author: abhisheksr01

.github/workflows/pipeline.yml

@@ -102,6 +102,7 @@ jobs:
         env:
           NVD_API_KEY: ${{ secrets.NVD_API_KEY }}
   sast-snyk:
+    if: github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     needs: build
     steps:
@@ -144,7 +145,6 @@ jobs:
       - unit-test
       - mutation-test
       - dependency-vulnerability-analysis
-      - sast-snyk
       - sast-iac-trivy-hadolint
     if: github.event.pull_request.user.login == 'dependabot[bot]' && github.repository == 'abhisheksr01/spring-boot-microservice-best-practices'
     steps: