System-wide webhooks

[jamesorlakin]

#10545 was indeed too basic. This PR attempts to add webhooks that work system-wide, regardless of repository. The intent is to allow a savvy sysadmin to extend Gitea's functionality by being able to listen for all events - opened PRs/comments to add Jira cards to, deleting Docker images for the repo, etc. This also leaves default webhooks intact with a lot of code reuse but I fear it may be a tad confusing.

Tasks:

• Create a new column to differentiate system webhooks from default ones
• Adjust the router to serve both hooks and system-hooks reusing the same handlers
• Tweak the creation of webhooks to determine if setting a value in the new column is necessary
• Create modifications to the template and locales to explain the differences between the two
• Fetch system webhooks and make use of them during events
• Add API endpoints (will attempt in a separate PR)
  ...and probably something else

I'm more than happy to receive any feedback. This is my biggest PR so far but I'm growing quite fond of Go! 🚀

[jamesorlakin]

@lafriks Oh yep! false and 0 should be different things... 👍

[jamesorlakin]

Looking at what's currently there, there's no API for default webhooks. Should I look at trying to add that for both default and system webhooks (maybe another PR) or just leave everything as-is?

[lafriks]

You can leave that for different PR. If code is too large it is harder to review and it takes more time to get it merged

[codecov-io]

Codecov Report

Merging #10546 into master will decrease coverage by 0.07%.
The diff coverage is 8.69%.

@@            Coverage Diff             @@
##           master   #10546      +/-   ##
==========================================
- Coverage   43.78%    43.7%   -0.08%     
==========================================
  Files         586      587       +1     
  Lines       81764    81836      +72     
==========================================
- Hits        35798    35769      -29     
- Misses      41531    41623      +92     
- Partials     4435     4444       +9

Impacted Files	Coverage Δ
models/migrations/migrations.go	4.16% <ø> (ø)	⬆️
routers/admin/hooks.go	0% <0%> (ø)	⬆️
models/migrations/v128.go	0% <0%> (ø)
routers/repo/webhook.go	1.24% <0%> (-0.04%)	⬇️
routers/routes/routes.go	86.27% <100%> (ø)	⬆️
models/webhook.go	66.98% <38.09%> (-1.73%)	⬇️
modules/webhook/webhook.go	43.88% <50%> (+0.27%)	⬆️
modules/indexer/stats/queue.go	62.5% <0%> (-18.75%)	⬇️
modules/indexer/stats/db.go	40.62% <0%> (-9.38%)	⬇️
services/pull/check.go	48.17% <0%> (-7.32%)	⬇️
... and 12 more

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[lunny]

Please resolve the conflicts

[lafriks]

Make lgtm work

[guillep2k]

What about adding a changelog label?