feat(protected-branch): silently ignore ref not found when deleting

plugins/protected-branch/src/index.ts

@@ -1,5 +1,6 @@
 import { Auto, IPlugin, validatePluginConfiguration } from "@auto-it/core";
 import * as t from "io-ts";
+import { RequestError } from "@octokit/request-error";
 import { GitOperator } from "./GitOperator";
 
 const pluginOptions = t.partial({
@@ -111,11 +112,18 @@ export default class ProtectedBranchPlugin implements IPlugin {
 
       auto.logger.log.info("Delete release branch 🗑️ ");
 
-      await auto.git.github.git.deleteRef({
-        owner: auto.git.options.owner,
-        repo: auto.git.options.repo,
-        ref: `heads/${headBranch}`,
-      });
+      try {
+        await auto.git.github.git.deleteRef({
+          owner: auto.git.options.owner,
+          repo: auto.git.options.repo,
+          ref: `heads/${headBranch}`,
+        });
+      } catch (e) {
+        // Silently ignore reference not found error since the ref might already be deleted
+        if (!e || e.status !== 422 || e.message !== "Reference does not exist") {
+          throw e;
+        }
+      }
     });
   }
 }