add cron job to delete old actions from database

[a1012112796]

that's a way to save database storage space.

[zeripath]

TBH I think we're getting to the point quickly whereby we just need to allow people to run arbitrary SQL etc. as a cron task.

[6543]

@zeripath they can do this right now by a linux cron task and some scripts ...!

Windows has something similar too, for mac i dont know

[codecov-commenter]

Codecov Report

Merging #15688 (9fa833f) into master (ca0460b) will increase coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master   #15688      +/-   ##
==========================================
+ Coverage   43.90%   43.92%   +0.01%     
==========================================
  Files         678      678              
  Lines       81809    81827      +18     
==========================================
+ Hits        35921    35939      +18     
+ Misses      40041    40036       -5     
- Partials     5847     5852       +5     

Impacted Files	Coverage Δ
models/action.go	47.12% <0.00%> (-1.40%)	⬇️
modules/cron/tasks_extended.go	69.44% <69.23%> (-0.03%)	⬇️
modules/process/manager.go	72.83% <0.00%> (-2.47%)	⬇️
modules/queue/workerpool.go	58.77% <0.00%> (-1.23%)	⬇️
models/repo_list.go	77.04% <0.00%> (-0.78%)	⬇️
models/gpg_key.go	54.07% <0.00%> (+0.56%)	⬆️
services/pull/patch.go	55.93% <0.00%> (+1.69%)	⬆️
services/pull/check.go	28.76% <0.00%> (+2.73%)	⬆️
modules/notification/mail/mail.go	41.83% <0.00%> (+3.06%)	⬆️
services/pull/temp_repo.go	29.78% <0.00%> (+3.19%)	⬆️

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