(maint) - add checkout reference

Author: jordanbreen28

.github/workflows/ci.yml

@@ -22,6 +22,8 @@ jobs:
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v3"
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}}
 
       - name: "Setup ruby"
         uses: "ruby/setup-ruby@v1"
@@ -50,6 +52,8 @@ jobs:
 
       - name: "Checkout"
         uses: "actions/checkout@v3"
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}}
 
       - name: "Setup ruby"
         uses: "ruby/setup-ruby@v1"