Uploading to Opera returns no errors but doesn't seem to do anything?

When trying `shipit opera dist` it doesn't throw an error, but I also don't see my extension in the store.

I do get these warnings however

```
- Packing extension...
(node:1808) Warning: Accessing non-existent property 'cat' of module exports inside circular dependency
(Use `node --trace-warnings ...` to show where the warning was created)
(node:1808) Warning: Accessing non-existent property 'cd' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'chmod' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'cp' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'dirs' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'pushd' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'popd' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'echo' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'tempdir' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'pwd' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'exec' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'ls' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'find' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'grep' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'head' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'ln' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'mkdir' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'rm' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'mv' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'sed' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'set' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'sort' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'tail' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'test' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'to' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'toEnd' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'touch' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'uniq' of module exports inside circular dependency
(node:1808) Warning: Accessing non-existent property 'which' of module exports inside circular dependency
```

Reproduce `shipit opera dist` and capture the complete output after the “Packing extension...” warning. Trace whether the command reaches the Opera upload step and define done as either reporting the upload failure clearly or confirming that the extension was submitted successfully.

Written by the indexing model from the issue text.