CI: skip unwanted .NET routines (#270)

Author: DedSec256

.github/workflows/ci.yml

@@ -10,6 +10,8 @@ jobs:
     env:
       NUGET_PACKAGES: ${{ github.workspace }}/.github/nuget-packages
       GRADLE_USER_HOME: ${{ github.workspace }}/.github/gradle
+      DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+      DOTNET_CLI_TELEMETRY_OPTOUT: true
     steps:
       - uses: actions/checkout@v2