feat: add Task.runtimeMetadata for host-resolved worker secrets

conductor-client/src/main/java/com/netflix/conductor/common/metadata/tasks/Task.java

@@ -22,6 +22,7 @@
 import com.netflix.conductor.common.metadata.workflow.WorkflowTask;
 import com.netflix.conductor.common.run.tasks.TypedTask;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import lombok.*;
 
 @Data
@@ -145,6 +146,14 @@
 
     private WorkflowTask workflowTask;
 
+    /**
+     * Secret values the server resolved for this task at poll time and delivered on the wire only
+     * (never persisted). Populated when the task's {@code TaskDef.runtimeMetadata} declares secret
+     * names the host resolves from its secret store (conductor-oss PR #1255). Empty/absent otherwise.
+     */
+    @JsonInclude(JsonInclude.Include.NON_EMPTY)
+    private Map<String, String> runtimeMetadata;
+
     private String domain;
 
     // id 31 is reserved
@@ -184,7 +193,7 @@
      * {@code TaskDef.runtimeMetadata} — resolved
      * at poll time, wire-only, never persisted to task input.
      */
     private Map<String, String> runtimeMetadata;
 
     public void setInputData(Map<String, Object> inputData) {
         if (inputData == null) {

conductor-client/src/test/java/com/netflix/conductor/common/metadata/tasks/TaskRuntimeMetadataSerDeTest.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2025 Conductor Authors.
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+package com.netflix.conductor.common.metadata.tasks;
+
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.PropertyAccessor;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * The server delivers host-resolved secret values on {@code Task.runtimeMetadata} (wire-only, never
+ * persisted) when a worker's {@code TaskDef.runtimeMetadata} declares secret names (conductor-oss PR
+ * #1255). This verifies the client model round-trips the field and omits it when empty.
+ */
+public class TaskRuntimeMetadataSerDeTest {
+
+    private ObjectMapper mapper() {
+        ObjectMapper m = new ObjectMapper();
+        m.setVisibility(PropertyAccessor.GETTER, JsonAutoDetect.Visibility.NONE);
+        m.setVisibility(PropertyAccessor.IS_GETTER, JsonAutoDetect.Visibility.NONE);
+        m.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
+        return m;
+    }
+
+    @Test
+    public void runtimeMetadata_roundTrips() throws Exception {
+        ObjectMapper mapper = mapper();
+        Task task = new Task();
+        task.setRuntimeMetadata(Map.of("GITHUB_TOKEN", "ghp_secret", "GH_APP_ID", "42"));
+
+        String json = mapper.writeValueAsString(task);
+        assertTrue(json.contains("\"runtimeMetadata\""), "field must serialize under the wire key");
+
+        Task back = mapper.readValue(json, Task.class);
+        assertEquals("ghp_secret", back.getRuntimeMetadata().get("GITHUB_TOKEN"));
+        assertEquals("42", back.getRuntimeMetadata().get("GH_APP_ID"));
+    }
+
+    @Test
+    public void runtimeMetadata_omittedWhenEmpty() throws Exception {
+        String json = mapper().writeValueAsString(new Task());
+        assertFalse(json.contains("runtimeMetadata"), "empty/absent map must not appear on the wire");
+    }
+}