[C#] Run tests against release library in determinism CI run

Author: TheBlueMatt

.github/workflows/build.yml

@@ -258,6 +258,13 @@ jobs:
             diffoscope ldk-java-bins/"${LDK_GARBAGECOLLECTED_GIT_OVERRIDE}/"org.ldk.nupkg c_sharp/org.ldk.nupkg || echo
             exit 1
           fi
+      - name: Run test against C# release library
+        shell: bash
+        run: |
+          cd c_sharp
+          ln -s ./packaging_artifacts/runtimes/linux-x64/native/libldkcsharp.so ./
+          LD_LIBRARY_PATH=. dotnet run --project tests.csproj
+          LD_LIBRARY_PATH=. dotnet run --project tests.csproj --configuration Release
 
   java_bindings:
     runs-on: ubuntu-latest

c_sharp/tests.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+
+</Project>

genbindings.sh

@@ -148,7 +148,7 @@ if [ "$2" = "c_sharp" ]; then
 		mono-csc -g -out:csharpldk.dll -langversion:3 -t:library -unsafe c_sharp/src/org/ldk/enums/*.cs c_sharp/src/org/ldk/impl/*.cs c_sharp/src/org/ldk/util/*.cs c_sharp/src/org/ldk/structs/*.cs
 	else
 		cd c_sharp
-		dotnet build --configuration Release
+		dotnet build csharpldk.csproj --configuration Release
 		cd ..
 	fi