Added WorkflowJobsClient

The WorkflowJobsClient provides the following:
* listWorkflowJobs - get workflow jobs for a given workflow run
* getWorkflowJob - get a workflow job by ID

listWorkflowJobs support filtering via query parameters.

Author: mitulamin

src/main/java/com/spotify/github/v3/clients/ActionsClient.java

@@ -43,4 +43,13 @@ static ActionsClient create(final GitHubClient github, final String owner, final
   public WorkflowsClient createWorkflowsClient() {
     return WorkflowsClient.create(github, owner, repo);
   }
+
+  /**
+   * Workflow Jobs API client
+   *
+   * @return WorkflowJobs API client
+   */
+  public WorkflowJobsClient createWorkflowJobsClient() {
+    return WorkflowJobsClient.create(github, owner, repo);
+  }
 }

src/main/java/com/spotify/github/v3/clients/WorkflowJobsClient.java

@@ -0,0 +1,81 @@
+/*-
+ * -\-\-
+ * github-api
+ * --
+ * Copyright (C) 2016 - 2020 Spotify AB
+ * --
+ * 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
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.spotify.github.v3.clients;
+
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableMap;
+import com.spotify.github.v3.actions.workflowjobs.ListWorkflowJobsQueryParams;
+import com.spotify.github.v3.actions.workflowjobs.WorkflowJobResponse;
+import com.spotify.github.v3.actions.workflowjobs.WorkflowJobsResponseList;
+
+import javax.annotation.Nullable;
+import javax.ws.rs.core.HttpHeaders;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Workflow Runs API client
+ */
+public class WorkflowJobsClient {
+  private static final String LIST_WORKFLOW_RUN_JOBS_URI = "/repos/%s/%s/actions/runs/%s/jobs";
+  private static final String GET_WORKFLOW_JOB_URI = "/repos/%s/%s/actions/jobs/%s";
+
+  private final GitHubClient github;
+  private final String owner;
+  private final String repo;
+
+  private final Map<String, String> extraHeaders =
+      ImmutableMap.of(HttpHeaders.ACCEPT, "application/vnd.github+json");
+
+  public WorkflowJobsClient(final GitHubClient github, final String owner, final String repo) {
+    this.github = github;
+    this.owner = owner;
+    this.repo = repo;
+  }
+
+  static WorkflowJobsClient create(final GitHubClient github, final String owner, final String repo) {
+    return new WorkflowJobsClient(github, owner, repo);
+  }
+
+  /**
+   * List all workflow run jobs for a repository.
+   *
+   * @param queryParams optional parameters to add to the query. Can be null.
+   * @return a list of workflow run jobs for the repository
+   */
+  public CompletableFuture<WorkflowJobsResponseList> listWorkflowJobs(final long runId, @Nullable final ListWorkflowJobsQueryParams queryParams) {
+    final String serial = (queryParams == null ? "" : queryParams.serialize());
+    final String path = String.format(LIST_WORKFLOW_RUN_JOBS_URI, owner, repo, runId) + (Strings.isNullOrEmpty(serial) ? "" : "?" + serial);
+    return github.request(path, WorkflowJobsResponseList.class, extraHeaders);
+  }
+
+  /**
+   * Gets a workflow job by id.
+   *
+   * @param jobId the workflow job id to be retrieved
+   * @return a WorkflowRunResponse
+   */
+  public CompletableFuture<WorkflowJobResponse> getWorkflowJob(final long jobId, @Nullable final ListWorkflowJobsQueryParams queryParams) {
+    final String serial = (queryParams == null ? "" : queryParams.serialize());
+    final String path = String.format(GET_WORKFLOW_JOB_URI, owner, repo, jobId) + (Strings.isNullOrEmpty(serial) ? "" : "?" + serial);
+    return github.request(path, WorkflowJobResponse.class, extraHeaders);
+  }
+}