While we will still build for 18.04, we will now stop testing against it. Instead, we will test against 20.04, the next EOL release after 18.04.
Once Ubuntu 18.04 is EOL, any references to it will also be removed.
Note that 18.04 support was already deprecated in Dokku 0.28.0, so this change is just acknowledging that deprecation.
While the latest packages may continue to work on other releases, we will no longer officially support these releases, nor will we distribute packages.
In some cases, it may be useful to completely override the set ports for a given application - such as on initial deploy when there is no global domain set. This change also further allows us to handle automation in a smoother fashion.
While there are a number of enhancements we could do to make port handling more seamless, this is a first step towards documenting the various oddities around port management for Docker vs Buildpack deploys.
Refs #2903Closes#2970
[ci skip]
