:sparkles: Add builder and dockerfile to sigma

[codecov[bot]]

Codecov Report

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

Project coverage is 23.52%. Comparing base (f1c862f) to head (4faf1db).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #340 +/- ## ========================================== - Coverage 24.05% 23.52% -0.53% ========================================== Files 275 273 -2 Lines 19095 18747 -348 ========================================== - Hits 4594 4411 -183 + Misses 14062 13930 -132 + Partials 439 406 -33 ``` | [Flag](https://app.codecov.io/gh/go-sigma/sigma/pull/340/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | Coverage Δ | | |---|---|---| | [unit-test-mysql](https://app.codecov.io/gh/go-sigma/sigma/pull/340/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | `23.52% <ø> (-0.53%)` | :arrow_down: | | [unit-test-postgresql](https://app.codecov.io/gh/go-sigma/sigma/pull/340/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | `23.52% <ø> (-0.53%)` | :arrow_down: | | [unit-test-sqlite3](https://app.codecov.io/gh/go-sigma/sigma/pull/340/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | `23.52% <ø> (-0.53%)` | :arrow_down: | 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=go-sigma#carryforward-flags-in-the-pull-request-comment) to find out more.

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