Created a preview mechanism allowing to deploy the app and validate it is working as expected

[EtienneDx]

When receiving a PR, it can be hard to visualise what the result would look like. This PR aims at allowing the publication of the feature to a new instance, allowing proper testing. The instance will run for 30 minutes after being released.

See #41 for more infos.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 13.51351% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 77.48%. Comparing base (345fbe2) to head (764b75f).

Files	Patch %	Lines
ssh-server/src/server/request_handler.rs	0.00%	13 Missing :warning:
gmt-api/src/main.rs	0.00%	10 Missing :warning:
gmt-server/src/main.rs	0.00%	8 Missing :warning:
database/src/error.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #45 +/- ## ========================================== - Coverage 77.89% 77.48% -0.41% ========================================== Files 35 35 Lines 1669 1679 +10 ========================================== + Hits 1300 1301 +1 - Misses 369 378 +9 ```

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[github-actions[bot]]

Deployment successful.

You can start and stop the instance using the given actions with the parameter "45".

You can access the application at https://dxbds0mjsj2zb.cloudfront.net/.

[EtienneDx]

@Lerri-Cofannos We're finally ready to merge! I'm doing a final readthrough of the code and if you have a minute to do so too, we should be able to merge afterwards.

[github-actions[bot]]

Deployment status.

Deployment has been successful.

You can start and stop the instance using the given actions with the parameter "45".

You can access the application at https://dy1r2j2tbpmnx.cloudfront.net/.