chore: enable deterministic build on CI (dotnet#2914)

Author: filzrev

build/common.props

@@ -11,6 +11,7 @@
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/dotnet/BenchmarkDotNet</RepositoryUrl>
+    <ContinuousIntegrationBuild Condition="'$(GITHUB_ACTIONS)' == 'true'">true</ContinuousIntegrationBuild>
 
     <CLSCompliant>true</CLSCompliant>
     <ComVisible>false</ComVisible>