Add mariner queue to helix matrix (#33390)

eng/targets/Helix.Common.props

@@ -25,6 +25,7 @@
     <HelixAvailableTargetQueue Include="Redhat.7.Amd64.Open" Platform="Linux" />
     <HelixAvailableTargetQueue Include="(Fedora.33.Amd64.Open)[email protected]/dotnet-buildtools/prereqs:fedora-33-helix-20210120000908-a9df267" Platform="Linux" />
     <HelixAvailableTargetQueue Include="(Alpine.312.Amd64.Open)[email protected]/dotnet-buildtools/prereqs:alpine-3.12-helix-20200908125345-56c6673" Platform="Linux" />
+    <HelixAvailableTargetQueue Include="(Mariner)[email protected]/dotnet-buildtools/prereqs:cbl-mariner-1.0-helix-20210528192219-92bf620" Platform="Linux" />    
   </ItemGroup>
   <ItemGroup Condition="'$(TargetArchitecture)' == 'x64' AND '$(IsHelixDaily)' == 'true' AND '$(_UseHelixOpenQueues)' == 'true'">
     <!-- TODO Re-enable Win-7 queue when dotnet restore are fixed. https://github.com/dotnet/aspnetcore/issues/32683 -->