Merge pull request #1080 from pytorch/add_pr_assigner_support

Add PR assigner support

Author: narendasan

.github/actions/assigner/dist/index.js

@@ -37,7 +37,13 @@ const fs = __importStar(__nccwpck_require__(7147));
 function getIssueNum() {
     const issue = github.context.payload.issue;
     if (!issue) {
-        return undefined;
+        const pr = github.context.payload.pull_request;
+        if (!pr) {
+            return undefined;
+        }
+        else {
+            return pr.number;
+        }
     }
     else {
         return issue.number;

.github/actions/assigner/src/main.ts

@@ -8,7 +8,12 @@ type GHClient = ReturnType<typeof github.getOctokit>;
 function getIssueNum(): number | undefined {
   const issue = github.context.payload.issue;
   if (!issue) {
-    return undefined;
+    const pr = github.context.payload.pull_request;
+    if (!pr) {
+      return undefined;
+    } else {
+      return pr.number;
+    }
   } else {
     return issue.number;
   }