Add celery worker to invoke map builds

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 23.52941% with 13 lines in your changes missing coverage. Please review.

Project coverage is 93.83%. Comparing base (fb4ca0f) to head (82afd97). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/meshapi/tasks.py	23.52%	13 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #701 +/- ## ========================================== - Coverage 94.19% 93.83% -0.37% ========================================== Files 80 80 Lines 3293 3310 +17 ========================================== + Hits 3102 3106 +4 - Misses 191 204 +13 ```

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