Add post hooks for cleanup (#193)

* Add post hooks for cleanup

* Switch to signal-based cleanup

* Better exit handling

entry.ts

@@ -6,6 +6,7 @@
 
 import * as core from "@actions/core";
 import { main } from "./main.ts";
+import { runCleanup } from "./utils/exitHandler.ts";
 
 async function run(): Promise<void> {
   try {
@@ -17,6 +18,8 @@ async function run(): Promise<void> {
   } catch (error) {
     const errorMessage = error instanceof Error ? error.message : "Unknown error occurred";
     core.setFailed(`Action failed: ${errorMessage}`);
+  } finally {
+    await runCleanup();
   }
 }