Fix contract artifacts release

[boyuan-chen]

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Overview

Describe what your Pull Request is about in a few sentences.

Fix the contract artifacts release to the GCP storage

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Codecov Report

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

Project coverage is 79.52%. Comparing base (23ed3e3) to head (9ae9b9b). Report is 277 commits behind head on develop.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #254 +/- ## =========================================== + Coverage 78.10% 79.52% +1.42% =========================================== Files 28 41 +13 Lines 2137 3287 +1150 =========================================== + Hits 1669 2614 +945 - Misses 407 511 +104 - Partials 61 162 +101 ``` | [Flag](https://app.codecov.io/gh/bobanetwork/boba/pull/254/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bobanetwork) | Coverage Δ | | |---|---|---| | [cannon-go-tests](https://app.codecov.io/gh/bobanetwork/boba/pull/254/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bobanetwork) | `79.52% <ø> (+1.42%)` | :arrow_up: | 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=bobanetwork#carryforward-flags-in-the-pull-request-comment) to find out more. [see 12 files with indirect coverage changes](https://app.codecov.io/gh/bobanetwork/boba/pull/254/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bobanetwork)