feat: pull request backporting

feat: backport still open pull requests

src/service/git/git-service-factory.ts

@@ -0,0 +1,43 @@
+import GitService from "@bp/service/git/git-service";
+import { GitServiceType } from "@bp/service/git/git.types";
+import GitHubService from "@bp/service/git/github/github-service";
+import LoggerService from "@bp/service/logger/logger-service";
+import LoggerServiceFactory from "@bp/service/logger/logger-service-factory";
+
+/**
+ * Singleton git service factory class
+ */
+export default class GitServiceFactory {
+  
+  private static logger: LoggerService = LoggerServiceFactory.getLogger();
+  private static instance?: GitService;
+
+  public static getService(): GitService {
+    if (!GitServiceFactory.instance) {
+      throw new Error("You must call `init` method first!");
+    }
+
+    return GitServiceFactory.instance;
+  }
+
+  /**
+   * Initialize the singleton git management service
+   * @param type git management service type
+   * @param auth authentication, like github token
+   */
+  public static init(type: GitServiceType, auth: string): void {
+
+    if (GitServiceFactory.instance) {
+      GitServiceFactory.logger.warn("Git service already initialized!");
+      return;
+    }
+
+    switch(type) {
+      case GitServiceType.GITHUB:
+        GitServiceFactory.instance = new GitHubService(auth);   
+        break;
+      default:
+        throw new Error(`Invalid git service type received: ${type}`);
+    }
+  }
+}