Previously, the shorthand was not properly supported. While this _should_ be the domain of the gliderlabs/herokuish repository, we do it here as a courtesy to Dokku users.
Additionally, support the heroku-community => heroku mapping.
Closes#4452
The previous lever for manipulating this was the DOKKU_IMAGE environment variable. While this is all well and good, it only works for CNB and is yet another `DOKKU_*` environment variable that need not exist.
While this does not add support for manipulating the CNB stack just yet, the groundwork is set for the future.
Closes#4306
This change refactors the compiled golang plugins into 3 distinct binaries:
- commands: already existing
- subcommands/subcommands: entrypoint into all subcommands
- triggers: entrypoint into all triggers
It then further symlinks triggers and subcommands to the built binaries. This results in both a much faster build process as well as smaller package size.
