feat: add labels when locking (#4)

* add labels when locking

* Update README.md

* oops

* Update README.md

* Update lock.js

Author: hzoo

README.md

@@ -40,6 +40,8 @@ lockComment: >
 #   - no-locking
 # Limit to only `issues` or `pulls`
 # only: issues
+# Add a label when locking. Set to `false` to disable
+# lockLabel: 'outdated'
 ```
 
 ## How are issues and pull requests determined to be inactive?

src/lock.js

@@ -9,7 +9,7 @@ module.exports = class Lock {
 
   async lock() {
     const {owner, repo} = this.context.repo();
-    const {lockComment} = this.config;
+    const {lockComment, lockLabel} = this.config;
 
     const issues = await this.getLockableIssues();
     for (const issue of issues) {
@@ -23,6 +23,16 @@ module.exports = class Lock {
           body: lockComment
         });
       }
+      
+      if (lockLabel) {
+        this.logger.info(`[${issueUrl}] Labeling`);
+        await this.context.github.issues.addLabels({
+          owner,
+          repo,
+          number: issue.number,
+          labels: [lockLabel]
+        });
+      }
 
       this.logger.info(`[${issueUrl}] Locking`);
       await this.context.github.issues.lock({