Add a script to build a standalone binary

[codecov-commenter]

Codecov Report

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

Comparison is base (5a6f8a5) 91.58% compared to head (45b3754) 91.60%. Report is 12 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #828 +/- ## ========================================== + Coverage 91.58% 91.60% +0.01% ========================================== Files 167 168 +1 Lines 6896 6929 +33 ========================================== + Hits 6316 6347 +31 - Misses 580 582 +2 ``` | [Flag](https://app.codecov.io/gh/GitGuardian/ggshield/pull/828/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=GitGuardian) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/GitGuardian/ggshield/pull/828/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=GitGuardian) | `91.60% <ø> (+0.01%)` | :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=GitGuardian#carryforward-flags-in-the-pull-request-comment) to find out more.

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