fix: checkout package before creating release

Author: Sam Harrison

.github/workflows/test-and-deploy.yml

@@ -42,6 +42,9 @@ jobs:
     needs: [ test ]
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout smtpapi-go
+        uses: actions/checkout@v2
+
       - name: Create GitHub Release
         uses: sendgrid/dx-automator/actions/release@main
         env: