fix(tooling): checkout-in-github-actions (#1449)

Co-authored-by: Shreyas Sharma <shreysh2@cisco.com>

Author: Shreyas281299

.github/workflows/pull-request.yml

@@ -19,6 +19,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
@@ -44,6 +46,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
@@ -84,6 +88,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
@@ -114,6 +120,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
@@ -169,6 +177,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Set up Node.js
         uses: actions/setup-node@v3