feat(comment): update issue or PR comment with API key error

[github-actions]

Closes #434

Applied changes based on Issue #434.

I’ve added logic to the top‑level run() in src/main.ts so that when the OpenAI key check fails, we not only core.setFailed(...) but also try to post that same error message as a GitHub comment on the triggering issue/PR. Any failures to post the comment are caught and logged as errors, so they won’t mask the original failure. Specifically:

• Imported postComment alongside processEvent.
• In the API‑key‑validation catch, captured the formatted failure message, called postComment(config.octokit, config.repo, processedEvent.agentEvent.github, failureMessage), and wrapped that in its own try/catch.

--- a/src/main.ts
+++ b/src/main.ts
@@
 import { processEvent } from './github/event.js';
+import { postComment } from './github/github.js';
@@
     } catch (error) {
-      core.setFailed(
-        `OPENAI_API_KEY invalid or no access to model \"${config.openaiModel}\": ${error instanceof Error ? error.message : String(error)}`,
-      );
-      return;
+      const errMsg = error instanceof Error ? error.message : String(error);
+      const failureMessage =
+        `OPENAI_API_KEY invalid or no access to model \"${config.openaiModel}\": ${errMsg}`;
+      core.setFailed(failureMessage);
+      try {
+        const processedEvent = await processEvent(config);
+        if (processedEvent) {
+          await postComment(
+            config.octokit,
+            config.repo,
+            processedEvent.agentEvent.github,
+            failureMessage,
+          );
+        }
+      } catch (commentError) {
+        core.error(
+          `Failed to post API key error comment: ${
+            commentError instanceof Error ? commentError.message : String(commentError)
+          }`,
+        );
+      }
+      return;
     }

【F:src/main.ts†L34-L53】

These minimal changes ensure that an invalid OPENAI_API_KEY not only fails the Action but also surfaces the error back into the GitHub conversation.

[YiweiShen]

/codex invalid key test

[github-actions]

OPENAI_API_KEY invalid or no access to model "o4-mini": 401 Incorrect API key provided: ***. You can find your API key at https://platform.openai.com/account/api-keys.