Add source to nuget

Author: jiechen0826

.github/workflows/ci.yml

@@ -70,10 +70,15 @@ jobs:
         source-url: ${{ env.FEED_URL }}
       env:
         NUGET_AUTH_TOKEN: $VSS_NUGET_ACCESSTOKEN
+    
+    - name: Dotnet add source
+      run: |
+        dotnet nuget add source ${{ env.FEED_URL }} \
+          --name $PACKAGE_NAME
 
     - name: dotnet restore package
       run: |
-        dotnet restore 
+        dotnet restore
 
   lint:
     runs-on: [self-hosted, 1ES.Pool=containerplat-github-runner-pool-east-us-2, 1ES.ImageOverride=mms-ws2022-containers-enabled]