Do not deploy extension during AppVeyor builds

Author: sharwell

AsyncUsageAnalyzers/AsyncUsageAnalyzers.Vsix/AsyncUsageAnalyzers.Vsix.csproj

@@ -24,6 +24,10 @@
     <CopyOutputSymbolsToOutputDirectory>false</CopyOutputSymbolsToOutputDirectory>
     <VSSDKTargetPlatformRegRootSuffix>Roslyn</VSSDKTargetPlatformRegRootSuffix>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(BuildingInsideVisualStudio)' != 'true'">
+    <!-- This property disables extension deployment for command line builds; required for AppVeyor and the build script -->
+    <DeployExtension>False</DeployExtension>
+  </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>