Add options to control the database connections (open,idle,timeout)

[6543]

this allow more fine control and make sure woodpecker do not crash in high use scenarios where the engine try to create more connection as the database do allow ... (mariadb=100)

[woodpecker-bot]

Deployment of preview was torn down

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 26.50%. Comparing base (b0f52b9) to head (63f5552).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/server/setup.go	0.00%	7 Missing ⚠️
server/store/datastore/engine.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4212      +/-   ##
==========================================
- Coverage   26.52%   26.50%   -0.02%     
==========================================
  Files         377      378       +1     
  Lines       27448    27506      +58     
==========================================
+ Hits         7281     7291      +10     
- Misses      19503    19549      +46     
- Partials      664      666       +2     

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[qwerty287]

The defaults are the default values of xorm?

[6543]

the defaults i took form gitea (beside max con) -> this is currently the issue and reason i want this option (codeberg server freequently fails on that one ...)

[qwerty287]

Can you use WOODPECKER_DATABASE_ as prefix, just like WOODPECKER_DATABASE_DATASOURCE? And add the old xorm var to the migration notes