build: enable single-file publishing compression

Enable compression of assemblies in the single-file distribution of GCM.
This helps reduce the overall size on disk of GCM, which is important on
Windows as we are bundled with Git for Windows, and we don't want to
bloat their distribution.

We only enable this compression on Windows. Mac and Linux remain
uncompressed.

Author: mjcheetham

src/shared/Git-Credential-Manager/Git-Credential-Manager.csproj

@@ -15,6 +15,16 @@
     <InvariantGlobalization>true</InvariantGlobalization>
   </PropertyGroup>
 
+  <PropertyGroup Condition="$(RuntimeIdentifier.StartsWith('win-'))">
+    <!--
+      Prefer to reduce the size of the single file by compressing the containing
+      assemblies. This will increase the startup time of the application a bit.
+      Keeping the on-disk size small is important because we are bundled inside
+      of Git for Windows and we don't want to bloat their distribution.
+    -->
+    <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
+  </PropertyGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\Atlassian.Bitbucket\Atlassian.Bitbucket.csproj" />
     <ProjectReference Include="..\GitHub\GitHub.csproj" />