🔀 Add canary job for trigger docker workflow (#3863)
🔀 Add canary job for trigger docker workflow (#3863)

* update event-type in trigger-docker workflow
* add dispatch_canary job
* change canary to trigger from maintenance
* add bleeding release type for trigger_docker.yml
* make things uglier to make prettier happy
foosel/OctoPrint,foosel/OctoPrint,foosel/OctoPrint,foosel/OctoPrint