fix(deploy-pre): Change on workflow

Changes to try to fix step 3

Author: gbm25

.github/workflows/deploy-pre-chatbot.yml

@@ -35,10 +35,11 @@ jobs:
         uses: actions/github-script@v6
         with:
           script: |
-            const pr = context.payload.issue.pull_request;
-            if (!pr) {
+            const issue = context.payload.issue;
+            if (!issue.pull_request) {
               throw new Error("This command can only be used on a pull request.");
             }
+            const pr = issue.pull_request;
             console.log("PR branch:", pr.head.ref);
             return { branch: pr.head.ref };
           result-encoding: json