Create a new label with TFM of the app and the SDK used to build the image

src/Containers/packaging/build/Microsoft.NET.Build.Containers.targets

@@ -141,6 +141,7 @@
       <ContainerGenerateLabelsImageTitle Condition="'$(ContainerGenerateLabelsImageTitle)' == ''">true</ContainerGenerateLabelsImageTitle>
       <ContainerGenerateLabelsImageBaseDigest Condition="'$(ContainerGenerateLabelsImageBaseDigest)' == ''">true</ContainerGenerateLabelsImageBaseDigest>
       <ContainerGenerateLabelsImageBaseName Condition="'$(ContainerGenerateLabelsImageBaseName)' == ''">true</ContainerGenerateLabelsImageBaseName>
+      <ContainerGenerateLabelsDotnetToolset Condition="'$(ContainerGenerateLabelsDotnetToolset)' == ''">true</ContainerGenerateLabelsDotnetToolset>
     </PropertyGroup>
 
     <PropertyGroup Label="Defaults for Container Labels">
@@ -167,6 +168,8 @@
       <!-- Need to compute digests, not just names, before we can light this up. This suggests we need a task where all of the 'read' steps are done. -->
       <!-- <ContainerLabel Condition="'$(ContainerGenerateLabelsImageBaseDigest)' == 'true' and '$(ContainerBaseImageDigest)' != ''" Include="org.opencontainers.image.base.digest" Value="$(ContainerBaseImageDigest)" /> -->
       <ContainerLabel Condition="'$(ContainerGenerateLabelsImageBaseName)' == 'true' and '$(ContainerBaseImage)' != ''" Include="org.opencontainers.image.base.name" Value="$(ContainerBaseImage)" />
+      <ContainerLabel Condition="'$(ContainerGenerateLabelsDotnetToolset)' == 'true' and '$(TargetFrameworkIdentifier)' == '.NETCoreApp'" Include="net.dot.runtime.majorminor" Value="$(_TargetFrameworkVersionWithoutV)" />
+      <ContainerLabel Condition="'$(ContainerGenerateLabelsDotnetToolset)' == 'true'" Include="net.dot.sdk.version" Value="$(NETCoreSdkVersion)" />
     </ItemGroup>
 
     <!-- These sourcelink-derived properties are only allowed to flow to generated artifacts if `PublishRepositoryUrl` is set as a user signal for opt-in.
@@ -195,7 +198,7 @@
       <ContainersPackageIdentity>Microsoft.NET.Build.Containers</ContainersPackageIdentity>
     </PropertyGroup>
     <ItemGroup>
-      <ContainersPackage Include="@(PackageReference)" Condition="'%(Identity)' == '$(ContainersPackageIdentity)'"/>
+      <ContainersPackage Include="@(PackageReference)" Condition="'%(Identity)' == '$(ContainersPackageIdentity)'" />
     </ItemGroup>
     <Warning Text="Microsoft.NET.Build.Containers NuGet package is explicitly referenced. Consider removing the package reference to Microsoft.NET.Build.Containers as it is now part of .NET SDK." Condition="'@(ContainersPackage)' != ''" />
     <PropertyGroup>

src/Tests/Microsoft.NET.Build.Containers.IntegrationTests/ProjectInitializer.cs

@@ -46,7 +46,7 @@ public static (Project, CapturingLogger, IDisposable) InitProject(Dictionary<str
         props["TargetFramework"] = "net7.0";
         props["_NativeExecutableExtension"] = ".exe"; //TODO: windows/unix split here
         props["Version"] = "1.0.0"; // TODO: need to test non-compliant version strings here
-        props["NetCoreSdkVersion"] = "7.0.100"; // TODO: float this to current SDK?
+        props["NETCoreSdkVersion"] = "7.0.100"; // TODO: float this to current SDK?
         // test setup parameters so that we can load the props/targets/tasks
         props["ContainerCustomTasksAssembly"] = Path.GetFullPath(Path.Combine(".", "Microsoft.NET.Build.Containers.dll"));
         props["_IsTest"] = "true";

src/Tests/Microsoft.NET.Build.Containers.IntegrationTests/TargetsTests.cs

@@ -203,6 +203,39 @@ public void ShouldIncludeBaseImageLabelsUnlessUserOptsOut(bool includeBaseImageL
         };
     }
 
+    [InlineData(true)]
+    [InlineData(false)]
+    [Theory]
+    public void ShouldIncludeSDKAndRuntimeVersionLabelsUnlessUserOptsOut(bool includeToolsetVersionLabels)
+    {
+        var runtimeMajorMinor = "7.0";
+        var randomSdkVersion = "8.0.100";
+        var expectedBaseImage = $"mcr.microsoft.com/dotnet/runtime:{runtimeMajorMinor}";
+        var (project, logger, d) = ProjectInitializer.InitProject(new()
+        {
+            ["ContainerGenerateLabelsDotnetToolset"] = includeToolsetVersionLabels.ToString(),
+            ["ContainerBaseImage"] = expectedBaseImage,
+            ["ContainerGenerateLabels"] = true.ToString(), // always include other labels, but not necessarily the toolset labels
+            ["NETCoreSdkVersion"] = randomSdkVersion // not functionally relevant for the test, just need a known version
+        }, projectName: $"{nameof(ShouldIncludeSDKAndRuntimeVersionLabelsUnlessUserOptsOut)}_{includeToolsetVersionLabels}");
+        using var _ = d;
+        var instance = project.CreateProjectInstance(global::Microsoft.Build.Execution.ProjectInstanceSettings.None);
+        instance.Build(new[] { ComputeContainerConfig }, new[] { logger }, null, out var outputs).Should().BeTrue("Build should have succeeded but failed due to {0}", String.Join("\n", logger.AllMessages));
+        var labels = instance.GetItems(ContainerLabel);
+        if (includeToolsetVersionLabels)
+        {
+            labels.Should().NotBeEmpty("Should have evaluated some labels by default")
+                .And.ContainSingle(label => LabelMatch("net.dot.runtime.majorminor", runtimeMajorMinor, label))
+                .And.ContainSingle(label => LabelMatch("net.dot.sdk.version", randomSdkVersion, label));
+        }
+        else
+        {
+            labels.Should().NotBeEmpty("Should have evaluated some labels by default")
+                .And.NotContain(label => LabelMatch("net.dot.runtime.majorminor", runtimeMajorMinor, label))
+                .And.NotContain(label => LabelMatch("net.dot.sdk.version", randomSdkVersion, label));
+        };
+    }
+
     [InlineData("7.0.100", "v7.0", "7.0")]
     [InlineData("7.0.100-preview.7", "v7.0", "7.0")]
     [InlineData("7.0.100-rc.1", "v7.0", "7.0")]