New pipeline events

[anbraten]

Some pipeline events that might be added in the future:

Possible events:

• PR close Support PR closed event #286

• Release (type: draft, pre, stable; action: created, updated, deleted) Add support for release event (Github, Gitea, Gitlab)  #764

• Cron Cron triggers #8 Add cron jobs #934

• Support manually triggering a pipeline Add support to trigger pipelines manually #83 Create build from API? #240

• comments (create, delete, update) / Add support for comment commands #814

• issue / pr_meta (include milestone, labels, description, comments as env vars)

  • created / re-openend
  • updated (also on milestone changed, label added, label removed, description, title updated)
  • closed

[anbraten]

duplicate of #3425