Support codespaces (#8347)

* Create devcontainer.json

* vs code extensions

* simplify

* Switch to java image

* Check for android

* Check for android

.devcontainer/devcontainer.json

@@ -0,0 +1,19 @@
+{
+  "image": "mcr.microsoft.com/devcontainers/java:17-bookworm",
+  "features": {
+      "ghcr.io/devcontainers/features/java:1": {
+          "version": "17"
+      }
+  },
+  "customizations": {
+      "vscode": {
+          "settings": {
+              "java.server.launchMode": "Standard"
+          },
+          "extensions": [
+              "vscjava.vscode-java-pack",
+              "vscjava.vscode-gradle"
+          ]
+      }
+  }
+}

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "java.compile.nullAnalysis.mode": "automatic"
+}

settings.gradle.kts

@@ -1,3 +1,5 @@
+import java.util.Properties
+
 rootProject.name = "okhttp-parent"
 
 plugins {
@@ -51,7 +53,15 @@ include(":container-tests")
 
 project(":okhttp-logging-interceptor").name = "logging-interceptor"
 
-if (!isKnownBrokenIntelliJ()) {
+val androidHome = System.getenv("ANDROID_HOME")
+val localProperties = Properties().apply {
+  val file = File("local.properties")
+  if (file.exists()) {
+    load(file.inputStream())
+  }
+}
+val sdkDir = localProperties.getProperty("sdk.dir")
+if ((androidHome != null || sdkDir != null) && !isKnownBrokenIntelliJ()) {
   include(":okhttp-android")
   include(":android-test")
   include(":android-test-app")