More changes to support AOT

Author: brianfeucht

sample/SampleLambda-dotnet8/HelloWorldHandler.cs

@@ -1,6 +1,7 @@
 using Amazon.Lambda.Core;
 using HeadlessChromium.Puppeteer.Lambda.Dotnet;
 using Microsoft.Extensions.Logging;
+using System.Text.Json.Serialization;
 
 namespace SampleLambda
 {
@@ -22,4 +23,17 @@ public async Task<byte[]> Handle(ILambdaContext context)
             return await File.ReadAllBytesAsync("./google.png");
         }
     }
+
+    /// <summary>
+    /// This class is used to register the input event and return type for the FunctionHandler method with the System.Text.Json source generator.
+    /// There must be a JsonSerializable attribute for each type used as the input and return type or a runtime error will occur
+    /// from the JSON serializer unable to find the serialization information for unknown types.
+    /// </summary>
+    [JsonSerializable(typeof(string))]
+    public partial class LambdaFunctionJsonSerializerContext : JsonSerializerContext
+    {
+        // By using this partial class derived from JsonSerializerContext, we can generate reflection free JSON Serializer code at compile time
+        // which can deserialize our class and properties. However, we must attribute this class to tell it what types to generate serialization code for.
+        // See https://docs.microsoft.com/en-us/dotnet/standard/serialization/system-text-json-source-generation
+    }
 }

sample/SampleLambda-dotnet8/aws-lambda-tools-defaults.json

@@ -6,5 +6,6 @@
   "function-timeout": 60,
   "function-handler": "SampleLambda::SampleLambda.HelloWorldHandler::Handle",
   "package-type": "image",
-  "docker-host-build-output-dir": "./bin/Release/lambda-publish"
-}
+  "docker-host-build-output-dir": "./bin/Release/lambda-publish",
+  "msbuild-parameters": "--self-contained true"
+}