Adding workflow validation

.github/workflows/templates-stats.yml

@@ -9,6 +9,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    if: github.repository == 'projectdiscovery/nuclei-templates' && github.ref == 'refs/heads/master'
     steps:
       - name: Checkout Repo
         uses: actions/checkout@master