C#: Add .NET 3 integration test

Author: hvitved

csharp/ql/integration-tests/linux/standalone_dotnet3/Files.expected

@@ -0,0 +1 @@
+| Program.cs:0:0:0:0 | Program.cs |

csharp/ql/integration-tests/linux/standalone_dotnet3/Files.ql

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+import csharp
+
+from File f
+where f.fromSource()
+select f

csharp/ql/integration-tests/linux/standalone_dotnet3/Program.cs

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+using System;
+
+namespace standalone_dotnet3
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}

csharp/ql/integration-tests/linux/standalone_dotnet3/global.json

@@ -0,0 +1,6 @@
+{
+    "sdk": {
+        "version": "3.1.403",
+        "rollForward": "latestFeature"
+    }
+}

csharp/ql/integration-tests/linux/standalone_dotnet3/standalone_dotnet3.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

csharp/ql/integration-tests/linux/standalone_dotnet3/test.py

@@ -0,0 +1,4 @@
+import os
+
+def test(codeql, csharp):
+    codeql.database.create(build_mode="none")