feat: pull request backporting

feat: backport still open pull requests

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

@@ -0,0 +1,24 @@
+import LoggerService from "@bp/service/logger/logger-service";
+import LoggerServiceFactory from "@bp/service/logger/logger-service-factory";
+import { Octokit } from "@octokit/rest";
+
+/**
+ * Singleton factory class for {Octokit} instance
+ */
+export default class OctokitFactory {
+  
+  private static logger: LoggerService = LoggerServiceFactory.getLogger();
+  private static octokit?: Octokit;
+
+  public static getOctokit(token: string): Octokit {
+    if (!OctokitFactory.octokit) {
+      OctokitFactory.logger.info("Creating octokit instance.");
+      OctokitFactory.octokit = new Octokit({
+        auth: token,
+        userAgent: "lampajr/backporting"
+      });
+    }
+
+    return OctokitFactory.octokit;
+  }
+}