Do docker releases for pushes to release branches

[zeripath]

Ensure docker releases are updated with pushes to branches

[codecov-io]

Codecov Report

Merging #10330 into master will increase coverage by 0.02%.
The diff coverage is 73.33%.

@@            Coverage Diff             @@
##           master   #10330      +/-   ##
==========================================
+ Coverage    43.7%   43.73%   +0.02%     
==========================================
  Files         585      585              
  Lines       81016    81016              
==========================================
+ Hits        35407    35429      +22     
+ Misses      41223    41206      -17     
+ Partials     4386     4381       -5

Impacted Files	Coverage Δ
modules/notification/ui/ui.go	70.37% <73.33%> (ø)	⬆️
modules/indexer/stats/db.go	50% <0%> (-9.38%)	⬇️
models/unit.go	37.03% <0%> (-2.47%)	⬇️
services/pull/pull.go	34.23% <0%> (+0.3%)	⬆️
models/gpg_key.go	55.37% <0%> (+0.55%)	⬆️
models/notification.go	65.18% <0%> (+1.89%)	⬆️
modules/queue/unique_queue_disk_channel.go	55.76% <0%> (+1.92%)	⬆️
services/pull/check.go	35.36% <0%> (+2.43%)	⬆️
services/pull/patch.go	62.89% <0%> (+2.51%)	⬆️
services/pull/temp_repo.go	31.62% <0%> (+2.56%)	⬆️

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[sapk]

I am not sure that this will work especially for the tag name used and the autotag feature: http://plugins.drone.io/drone-plugins/drone-docker/#autotag

When the event type is push and the target branch is your default branch (e.g. master) the plugin will automatically tag the image as latest. All other event types and branches are ignored.

[sapk]

Also the manifest is only compatible with tag and latest and will not support release/v1.11 naming.
I also like that tag like 1 and 1.11 means latest tag 1.11.x and not tip of release/v1.11
I would suggest to revert this commit/PR.