Produce deterministic CI builds

This is a squashed merge or PR #975 that closes #973.

Author: atifaziz

MoreLinq/MoreLinq.csproj

@@ -148,6 +148,10 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="DotNet.ReproducibleBuilds" Version="1.1.1">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>

appveyor.yml

@@ -85,7 +85,7 @@ after_build:
     }
 - ps: |
     dir dist\*.nupkg | % {
-      dotnet meziantou.validate-nuget-package --excluded-rules IconMustBeSet,Symbols $_
+      dotnet meziantou.validate-nuget-package --excluded-rules IconMustBeSet $_
       if ($LASTEXITCODE) {
         throw "Package validation failed: $_"
       }