build(nightly): fix goreleaser configuration for nightly

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.14%. Comparing base (0d5c21e) to head (d5a48c3). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3614 +/- ## ======================================= Coverage 64.14% 64.14% ======================================= Files 169 169 Lines 16956 16956 ======================================= Hits 10876 10876 Misses 5400 5400 Partials 680 680 ``` | [Flag](https://app.codecov.io/gh/flipt-io/flipt/pull/3614/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=flipt-io) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/flipt-io/flipt/pull/3614/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=flipt-io) | `64.14% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=flipt-io#carryforward-flags-in-the-pull-request-comment) to find out more.

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