Fix Kubernetes publisher crash on Boolean/scalar environment variable values

src/Aspire.Hosting.Kubernetes/KubernetesResource.cs

@@ -386,6 +386,13 @@ private async Task<object> ProcessValueAsync(KubernetesEnvironmentContext contex
                 return s;
             }
 
+            // Handle scalar/primitive types (bool, int, long, double, etc.)
+            // These can appear when third-party integrations set environment variables to non-string values.
+            if (value is IConvertible)
+            {
+                return string.Format(CultureInfo.InvariantCulture, "{0}", value);
+            }
+
             if (value is EndpointReference ep)
             {
                 var referencedResource = ep.Resource == this

tests/Aspire.Hosting.Kubernetes.Tests/KubernetesPublisherTests.cs

@@ -619,6 +619,55 @@ public async Task PublishAsync_ConditionalWithParameterBranch_UsesIfElseSyntax()
         await settingsTask;
     }
 
+    [Fact]
+    public async Task PublishAsync_HandlesScalarEnvironmentVariableTypes()
+    {
+        using var tempDir = new TestTempDirectory();
+        var builder = TestDistributedApplicationBuilder.Create(DistributedApplicationOperation.Publish, tempDir.Path);
+
+        builder.AddKubernetesEnvironment("env");
+
+        var api = builder.AddContainer("myapp", "mcr.microsoft.com/dotnet/aspnet:8.0")
+            .WithEnvironment(context =>
+            {
+                context.EnvironmentVariables["BOOL_TRUE"] = true;
+                context.EnvironmentVariables["BOOL_FALSE"] = false;
+                context.EnvironmentVariables["INT_VALUE"] = 42;
+                context.EnvironmentVariables["DOUBLE_VALUE"] = 3.14;
+            })
+            .WithEnvironment("STRING_VALUE", "hello");
+
+        var app = builder.Build();
+        app.Run();
+
+        var expectedFiles = new[]
+        {
+            "Chart.yaml",
+            "values.yaml",
+            "templates/myapp/deployment.yaml",
+            "templates/myapp/config.yaml",
+        };
+
+        SettingsTask settingsTask = default!;
+
+        foreach (var expectedFile in expectedFiles)
+        {
+            var filePath = Path.Combine(tempDir.Path, expectedFile);
+            var fileExtension = Path.GetExtension(filePath)[1..];
+
+            if (settingsTask is null)
+            {
+                settingsTask = Verify(File.ReadAllText(filePath), fileExtension);
+            }
+            else
+            {
+                settingsTask = settingsTask.AppendContentAsFile(File.ReadAllText(filePath), fileExtension);
+            }
+        }
+
+        await settingsTask;
+    }
+
     private sealed class TestConditionProvider(string value) : IValueProvider, IManifestExpressionProvider
     {
         public string ValueExpression => "test-condition";

tests/Aspire.Hosting.Kubernetes.Tests/Snapshots/KubernetesPublisherTests.PublishAsync_HandlesScalarEnvironmentVariableTypes#00.verified.yaml

@@ -0,0 +1,11 @@
+apiVersion: "v2"
+name: "aspire-hosting-tests"
+version: "0.1.0"
+kubeVersion: ">= 1.18.0-0"
+description: "Aspire Helm Chart"
+type: "application"
+keywords:
+  - "aspire"
+  - "kubernetes"
+appVersion: "0.1.0"
+deprecated: false

tests/Aspire.Hosting.Kubernetes.Tests/Snapshots/KubernetesPublisherTests.PublishAsync_HandlesScalarEnvironmentVariableTypes#01.verified.yaml

@@ -0,0 +1,9 @@
+parameters: {}
+secrets: {}
+config:
+  myapp:
+    BOOL_TRUE: "True"
+    BOOL_FALSE: "False"
+    INT_VALUE: "42"
+    DOUBLE_VALUE: "3.14"
+    STRING_VALUE: "hello"

tests/Aspire.Hosting.Kubernetes.Tests/Snapshots/KubernetesPublisherTests.PublishAsync_HandlesScalarEnvironmentVariableTypes#02.verified.yaml

@@ -0,0 +1,36 @@
+---
+apiVersion: "apps/v1"
+kind: "Deployment"
+metadata:
+  name: "myapp-deployment"
+  labels:
+    app.kubernetes.io/name: "aspire-hosting-tests"
+    app.kubernetes.io/component: "myapp"
+    app.kubernetes.io/instance: "{{ .Release.Name }}"
+spec:
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: "aspire-hosting-tests"
+        app.kubernetes.io/component: "myapp"
+        app.kubernetes.io/instance: "{{ .Release.Name }}"
+    spec:
+      containers:
+        - image: "mcr.microsoft.com/dotnet/aspnet:8.0"
+          name: "myapp"
+          envFrom:
+            - configMapRef:
+                name: "myapp-config"
+          imagePullPolicy: "IfNotPresent"
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: "aspire-hosting-tests"
+      app.kubernetes.io/component: "myapp"
+      app.kubernetes.io/instance: "{{ .Release.Name }}"
+  replicas: 1
+  revisionHistoryLimit: 3
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: "RollingUpdate"

tests/Aspire.Hosting.Kubernetes.Tests/Snapshots/KubernetesPublisherTests.PublishAsync_HandlesScalarEnvironmentVariableTypes#03.verified.yaml

@@ -0,0 +1,15 @@
+---
+apiVersion: "v1"
+kind: "ConfigMap"
+metadata:
+  name: "myapp-config"
+  labels:
+    app.kubernetes.io/name: "aspire-hosting-tests"
+    app.kubernetes.io/component: "myapp"
+    app.kubernetes.io/instance: "{{ .Release.Name }}"
+data:
+  BOOL_TRUE: "{{ .Values.config.myapp.BOOL_TRUE }}"
+  BOOL_FALSE: "{{ .Values.config.myapp.BOOL_FALSE }}"
+  INT_VALUE: "{{ .Values.config.myapp.INT_VALUE }}"
+  DOUBLE_VALUE: "{{ .Values.config.myapp.DOUBLE_VALUE }}"
+  STRING_VALUE: "{{ .Values.config.myapp.STRING_VALUE }}"