Update test_pwn_vuln2.yml

Author: shubham-stepsecurity

.github/workflows/test_pwn_vuln2.yml

@@ -1,5 +1,5 @@
 on:
-  pull_request
+  pull_request:
 
 jobs:
   build:
@@ -13,4 +13,4 @@ jobs:
     - uses: actions/setup-node@v1
     - run: |
         npm install
-        npm build
+        npm build