ci: add osmosis chain to release script

[kerber0x]

Description and Motivation

This PR adds the osmosis chain flag on the build_release script.

Related Issues

---

Checklist:

• I have read Migaloo's contribution guidelines.
• My pull request has a sound title and description (not something vague like Update index.md)
• All existing and new tests are passing.
• I updated/added relevant documentation.
• The code is formatted properly cargo fmt --all --.
• Clippy doesn't report any issues cargo clippy -- -D warnings.
• I have regenerated the schemas if needed cargo schema.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c28658d) 94.51% compared to head (5c63d6d) 94.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #238   +/-   ##
=======================================
  Coverage   94.51%   94.51%           
=======================================
  Files         218      218           
  Lines       24708    24708           
=======================================
  Hits        23354    23354           
  Misses       1354     1354           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.