Use postgresql for tests

[armanddidierjean]

Description

Fix #403

Add Postgresql databse support for tests. Use a TestAppClient per test file, to prevent tests from a module to impact other modules

Configure a Postgresql database for the test workflow.
Run tests with Postgresql. Run migration tests with SQLite and Postgresql.

Checklist

• Created tests which fail without the change (if possible)
• All tests passing
• Extended the documentation, if necessary

[gitguardian]

⚠️ GitGuardian has uncovered 2 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
7298668	Triggered	Generic High Entropy Secret	73698d9	.env.test	View secret
7298668	Triggered	Generic High Entropy Secret	6dbd020	.env.test	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secrets safely. Learn here the best practices.
3. Revoke and rotate these secrets.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

---

^{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.67%. Comparing base (9e2b6d7) to head (6861a16).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #450      +/-   ##
==========================================
- Coverage   82.70%   82.67%   -0.04%     
==========================================
  Files          98       98              
  Lines        6142     6142              
==========================================
- Hits         5080     5078       -2     
- Misses       1062     1064       +2     

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