Update build CI to add nuget URL

Author: calebkiage

.github/workflows/build-cli.yml

@@ -3,6 +3,8 @@ on: [push]
 jobs:
   build:
     runs-on: ubuntu-latest
+    env:
+      NUGET_URL: https://nuget.pkg.github.com/microsoft/index.json
     steps:
       - name: Checkout
         uses: actions/checkout@v2