improved cleanup error message

dist/cleanup/index.js

@@ -1006,7 +1006,7 @@ function run() {
                 yield gpg.deleteKey(keyFingerprint);
             }
             catch (error) {
-                core.setFailed(error.message);
+                core.setFailed('failed to remove private key');
             }
         }
     });

src/cleanup-java.ts

@@ -11,7 +11,7 @@ async function run() {
       );
       await gpg.deleteKey(keyFingerprint);
     } catch (error) {
-      core.setFailed(error.message);
+      core.setFailed('failed to remove private key');
     }
   }
 }