Add configuration to control ServiceAccount generation for Knative image pull secrets

extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/AddImagePullSecretToRevisionSpecDecorator.java

@@ -0,0 +1,20 @@
+package io.quarkus.kubernetes.deployment;
+
+import io.dekorate.kubernetes.decorator.NamedResourceDecorator;
+import io.fabric8.knative.serving.v1.RevisionSpecFluent;
+import io.fabric8.kubernetes.api.model.ObjectMeta;
+
+public class AddImagePullSecretToRevisionSpecDecorator extends NamedResourceDecorator<RevisionSpecFluent<?>> {
+
+    private final String imagePullSecret;
+
+    public AddImagePullSecretToRevisionSpecDecorator(String name, String imagePullSecret) {
+        super(name);
+        this.imagePullSecret = imagePullSecret;
+    }
+
+    @Override
+    public void andThenVisit(RevisionSpecFluent<?> revisionSpec, ObjectMeta resourceMeta) {
+        revisionSpec.addNewImagePullSecret(imagePullSecret);
+    }
+}

extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/KnativeConfig.java

@@ -79,4 +79,14 @@ default String targetPlatformName() {
      */
     @WithDefault("CreateOrUpdate")
     DeployStrategy deployStrategy();
+
+    /**
+     * Whether to add image pull secrets to a generated ServiceAccount.
+     * When set to true (default), image pull secrets are added to a ServiceAccount resource.
+     * When set to false, image pull secrets are added directly to the pod spec.
+     * Setting this to false is useful when deploying to environments like IBM Code Engine where users do not have
+     * permission to create ServiceAccount resources.
+     */
+    @WithDefault("true")
+    boolean addImagePullSecretsToServiceAccount();
 }

extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/KnativeProcessor.java

@@ -301,12 +301,20 @@ public List<DecoratorBuildItem> createDecorators(ApplicationInfoBuildItem applic
 
         //Handle Image Pull Secrets
         config.imagePullSecrets().ifPresent(imagePullSecrets -> {
-            String serviceAccountName = config.serviceAccount().orElse(name);
-            result.add(new DecoratorBuildItem(KNATIVE, new AddServiceAccountResourceDecorator(name)));
-            result.add(
-                    new DecoratorBuildItem(KNATIVE, new ApplyServiceAccountToRevisionSpecDecorator(name, serviceAccountName)));
-            result.add(new DecoratorBuildItem(KNATIVE,
-                    new AddImagePullSecretToServiceAccountDecorator(serviceAccountName, imagePullSecrets)));
+            if (config.addImagePullSecretsToServiceAccount()) {
+                String serviceAccountName = config.serviceAccount().orElse(name);
+                result.add(new DecoratorBuildItem(KNATIVE, new AddServiceAccountResourceDecorator(name)));
+                result.add(
+                        new DecoratorBuildItem(KNATIVE,
+                                new ApplyServiceAccountToRevisionSpecDecorator(name, serviceAccountName)));
+                result.add(new DecoratorBuildItem(KNATIVE,
+                        new AddImagePullSecretToServiceAccountDecorator(serviceAccountName, imagePullSecrets)));
+            } else {
+                for (String imagePullSecret : imagePullSecrets) {
+                    result.add(new DecoratorBuildItem(KNATIVE,
+                            new AddImagePullSecretToRevisionSpecDecorator(name, imagePullSecret)));
+                }
+            }
         });
 
         return result;

integration-tests/kubernetes/quarkus-standard-way/src/test/java/io/quarkus/it/kubernetes/KnativeWithImagePullSecretsTest.java

@@ -0,0 +1,64 @@
+package io.quarkus.it.kubernetes;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.fabric8.knative.serving.v1.Service;
+import io.fabric8.kubernetes.api.model.HasMetadata;
+import io.quarkus.builder.Version;
+import io.quarkus.maven.dependency.Dependency;
+import io.quarkus.test.ProdBuildResults;
+import io.quarkus.test.ProdModeTestResults;
+import io.quarkus.test.QuarkusProdModeTest;
+
+public class KnativeWithImagePullSecretsTest {
+
+    @RegisterExtension
+    static final QuarkusProdModeTest config = new QuarkusProdModeTest()
+            .withApplicationRoot((jar) -> jar.addClasses(GreetingResource.class))
+            .setApplicationName("knative-with-image-pull-secrets")
+            .setApplicationVersion("0.1-SNAPSHOT")
+            .overrideConfigKey("quarkus.kubernetes.deployment-target", "knative")
+            .overrideConfigKey("quarkus.knative.image-pull-secrets", "my-secret")
+            .overrideConfigKey("quarkus.knative.add-image-pull-secrets-to-service-account", "false")
+            .setForcedDependencies(List.of(Dependency.of("io.quarkus", "quarkus-kubernetes", Version.getVersion())));
+
+    @ProdBuildResults
+    private ProdModeTestResults prodModeTestResults;
+
+    @Test
+    public void assertGeneratedResources() throws IOException {
+        Path kubernetesDir = prodModeTestResults.getBuildDir().resolve("kubernetes");
+        assertThat(kubernetesDir)
+                .isDirectoryContaining(p -> p.getFileName().endsWith("knative.json"))
+                .isDirectoryContaining(p -> p.getFileName().endsWith("knative.yml"));
+        List<HasMetadata> kubernetesList = DeserializationUtil
+                .deserializeAsList(kubernetesDir.resolve("knative.yml"));
+
+        assertThat(kubernetesList).filteredOn(i -> "Service".equals(i.getKind())).singleElement().satisfies(i -> {
+            assertThat(i).isInstanceOfSatisfying(Service.class, s -> {
+                assertThat(s.getMetadata()).satisfies(m -> {
+                    assertThat(m.getName()).isEqualTo("knative-with-image-pull-secrets");
+                });
+
+                assertThat(s.getSpec()).satisfies(spec -> {
+                    assertThat(spec.getTemplate()).satisfies(template -> {
+                        assertThat(template.getSpec()).satisfies(revisionSpec -> {
+                            assertThat(revisionSpec.getImagePullSecrets()).hasSize(1);
+                            assertThat(revisionSpec.getImagePullSecrets().get(0).getName()).isEqualTo("my-secret");
+                        });
+                    });
+                });
+            });
+        });
+
+        // Ensure no ServiceAccount was generated
+        assertThat(kubernetesList).filteredOn(i -> "ServiceAccount".equals(i.getKind())).isEmpty();
+    }
+}