feat: job config

[jolheiser]

Resolves #361

Initially considered using a map, but this is more explicit which I think is better overall.

[aymanbagabas]

Thank you @jolheiser!

[codecov]

Codecov Report

Attention: 2057 lines in your changes are missing coverage. Please review.

Comparison is base (050a0d1) 50.52% compared to head (6d15cb2) 50.40%.
Report is 63 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #402      +/-   ##
==========================================
- Coverage   50.52%   50.40%   -0.13%     
==========================================
  Files         107      133      +26     
  Lines        8209    11327    +3118     
==========================================
+ Hits         4148     5709    +1561     
- Misses       3767     5178    +1411     
- Partials      294      440     +146     

Files	Coverage Δ
git/repo.go	50.69% <ø> (+6.71%)	⬆️
server/backend/backend.go	100.00% <100.00%> (ø)
server/backend/collab.go	86.66% <100.00%> (+0.95%)	⬆️
server/config/config.go	80.66% <100.00%> (+0.66%)	⬆️
server/config/file.go	100.00% <ø> (ø)
server/config/ssh.go	100.00% <100.00%> (ø)
server/cron/cron.go	90.00% <100.00%> (+30.00%)	⬆️
server/db/context.go	85.71% <100.00%> (ø)
server/db/db.go	43.90% <ø> (ø)
server/db/errors.go	31.57% <ø> (ø)
... and 69 more

... and 5 files with indirect coverage changes

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[aymanbagabas]

You need to add the