also add the mew file

src/pull_request_comment.ts

@@ -0,0 +1,37 @@
+import { info, warning } from "@actions/core";
+import { loadContext } from "./context";
+import config from "./config";
+import { initOctokit } from "./octokit";
+import { COMMENT_SIGNATURE } from "./messages";
+
+export async function handlePullRequestComment() {
+  const context = await loadContext();
+  if (context.eventName !== "pull_request_review_comment") {
+    warning("unsupported github event");
+    return;
+  }
+
+  const { comment, pull_request } = context.payload;
+  if (!comment) {
+    warning("`comment` is missing from payload");
+    return;
+  }
+  if (context.payload.action !== "created") {
+    warning("only consider newly created comments");
+    return;
+  }
+  if (!pull_request) {
+    warning("`pull_request` is missing from payload");
+    return;
+  }
+  if (isOwnComment(comment.body)) {
+    info("ignoring own comments");
+    return;
+  }
+
+  // TODO: implement
+}
+
+function isOwnComment(comment: string): boolean {
+  return comment.includes(COMMENT_SIGNATURE);
+}