Support enabling the agent in the DSL

Author: Aleksandar Gradinac

native-gradle-plugin/src/main/java/org/graalvm/buildtools/gradle/NativeImagePlugin.java

@@ -523,7 +523,7 @@ private static Provider<String> agentProperty(Project project, AgentOptions opti
                     }
                     return options.getDefaultMode().get();
                 })
-                .orElse(project.provider(() -> "disabled"));
+                .orElse(options.getEnabled().map(enabled -> enabled ? options.getDefaultMode().get() : "disabled"));
     }
 
     private static void registerServiceProvider(Project project, Provider<NativeImageService> nativeImageServiceProvider) {

native-gradle-plugin/src/main/java/org/graalvm/buildtools/gradle/dsl/agent/AgentOptions.java

@@ -72,6 +72,13 @@ default void modes(Action<? super AgentModeOptions> spec) {
     @Optional
     Property<String> getDefaultMode();
 
+    /**
+     * Enables the agent.
+     */
+    @Input
+    @Optional
+    Property<Boolean> getEnabled();
+
     /**
      * Caller-filter files that will be passed to the agent.
      */

native-gradle-plugin/src/main/java/org/graalvm/buildtools/gradle/internal/DefaultGraalVmExtension.java

@@ -78,6 +78,7 @@ public DefaultGraalVmExtension(NamedDomainObjectContainer<NativeImageOptions> na
         AgentOptions agentOpts = getAgent();
         agentOpts.getTasksToInstrumentPredicate().convention(t -> true);
         agentOpts.getDefaultMode().convention("standard");
+        agentOpts.getEnabled().convention(false);
         agentOpts.getModes().getConditional().getParallel().convention(true);
         agentOpts.getMetadataCopy().getMergeWithExisting().convention(false);
         agentOpts.getFilterableEntries().convention(Arrays.asList("org.gradle.", "java.", "org.junit."));