Don't fail the bash build if xbuild borks at copying things (it usually does...

Don't fail the bash build if xbuild borks at copying things (it usually does if Unity is open already)

build.sh

@@ -32,7 +32,7 @@ else
 	nuget restore
 fi
 
-xbuild GitHub.Unity.sln /verbosity:normal /property:Configuration=$Configuration /target:$Target
+xbuild GitHub.Unity.sln /verbosity:normal /property:Configuration=$Configuration /target:$Target || true
 
 cp -r unity/PackageProject/Assets/Editor/GitHub ../github-unity-test/GitHubExtensionProject/Assets/Editor || true