Add .NET 9 container build image support

Author: normj

.autover/changes/5450ccb1-5441-4af0-9e84-7db4f788046d.json

@@ -0,0 +1,11 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.Tools",
+      "Type": "Minor",
+      "ChangelogMessages": [
+        "Add container build support for .NET 9. This allows Native AOT .NET 9 Lambda function builds."
+      ]
+    }
+  ]
+}

src/Amazon.Lambda.Tools/LambdaUtilities.cs

@@ -26,6 +26,7 @@ namespace Amazon.Lambda.Tools
 {
     public static class TargetFrameworkMonikers
     {
+        public const string net90 = "net9.0";
         public const string net80 = "net8.0";
         public const string net70 = "net7.0";
         public const string net60 = "net6.0";
@@ -46,7 +47,8 @@ public static class TargetFrameworkMonikers
             net50,
             net60,
             net70,
-            net80
+            net80,
+            net90
         };
     }
 
@@ -56,7 +58,7 @@ public static class LambdaUtilities
 
         public static readonly IReadOnlyDictionary<string, string> _lambdaRuntimeToDotnetFramework = new Dictionary<string, string>()
         {
-            {"dotnet8", TargetFrameworkMonikers.net80}, // Use the string version since the SDK hasn't been updated yet.
+            {Amazon.Lambda.Runtime.Dotnet8.Value, TargetFrameworkMonikers.net80},
             {Amazon.Lambda.Runtime.Dotnet6.Value, TargetFrameworkMonikers.net60},
             {Amazon.Lambda.Runtime.Dotnetcore31.Value, TargetFrameworkMonikers.netcoreapp31},
             {Amazon.Lambda.Runtime.Dotnetcore21.Value, TargetFrameworkMonikers.netcoreapp21},
@@ -121,6 +123,8 @@ public static string GetDefaultBuildImage(string targetFramework, string archite
 
             switch (targetFramework?.ToLower())
             {
+                case TargetFrameworkMonikers.net90:
+                    return $"public.ecr.aws/sam/build-dotnet9:latest-{architecture}";
                 case TargetFrameworkMonikers.net80:
                     return $"public.ecr.aws/sam/build-dotnet8:latest-{architecture}";
                 case TargetFrameworkMonikers.net70:                    

test/Amazon.Lambda.Tools.Test/UtilitiesTests.cs

@@ -175,6 +175,10 @@ public void TestSavingDockerfileInDefaults(string dockerfilePath, string project
         [InlineData("net7.0", LambdaConstants.ARCHITECTURE_X86_64, "public.ecr.aws/sam/build-dotnet7:latest-x86_64")]
         [InlineData("net7.0", " ", "public.ecr.aws/sam/build-dotnet7:latest-x86_64")]
         [InlineData("net7.0", LambdaConstants.ARCHITECTURE_ARM64, "public.ecr.aws/sam/build-dotnet7:latest-arm64")]
+        [InlineData("net8.0", LambdaConstants.ARCHITECTURE_ARM64, "public.ecr.aws/sam/build-dotnet8:latest-arm64")]
+        [InlineData("net8.0", LambdaConstants.ARCHITECTURE_X86_64, "public.ecr.aws/sam/build-dotnet8:latest-x86_64")]
+        [InlineData("net9.0", LambdaConstants.ARCHITECTURE_ARM64, "public.ecr.aws/sam/build-dotnet9:latest-arm64")]
+        [InlineData("net9.0", LambdaConstants.ARCHITECTURE_X86_64, "public.ecr.aws/sam/build-dotnet9:latest-x86_64")]
         [InlineData(null, LambdaConstants.ARCHITECTURE_X86_64, "throws")]
         [InlineData(null, LambdaConstants.ARCHITECTURE_ARM64, "throws")]
         public void GetDefaultBuildImage(string targetFramework, string architecture, string expectedValue)