Add Docker image

[Neraste]

This PR adds a Dockerfile and deployment files to run the server and the front in production within a Docker image.

• Dockerfile;
• Configuration;
• Custom configuration;
• Logs format harmonisation;
• Execution dependency of the different supervisor programs;
• APScheduler;
• Redis;
• Environment variables prefix;
• MySQL;
  • Problem with the Player cache object that must have a migration file;
• Access logs to file?
• Run as a non-root user?

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.43%. Comparing base (51c64f5) to head (a511a53).

Files with missing lines	Patch %	Lines
dakara_server/playlist/signals.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #183      +/-   ##
===========================================
- Coverage    98.61%   98.43%   -0.19%     
===========================================
  Files           78       78              
  Lines         1876     1849      -27     
===========================================
- Hits          1850     1820      -30     
- Misses          26       29       +3     

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