Respond to issue comments

This is the more generic event that gets emitted when people leave comments

index.js

@@ -7,16 +7,16 @@ async function run() {
         const github_token = core.getInput('GITHUB_TOKEN');
 
       const context = github.context;
-      if (context.payload.pull_request == null) {
-          core.setFailed('No pull request found.');
+      if (context.issue.pull_request == null) {
+          core.setFailed('No issue request found.');
           return;
       }
-      const pull_request_number = context.payload.pull_request.number;
+      const issue_number = context.payload.issue.number;
 
       const octokit = new github.GitHub(github_token);
       const new_comment = octokit.issues.createComment({
           ...context.repo,
-          issue_number: pull_request_number,
+          issue_number: issue_number,
           body: comment
         });