This will allow us to more quickly update a dependency by adding support so that downstream repos can auto-push updates to the main repo when there is a release.
The image can now be built via:
docker buildx build --platform linux/arm,linux/arm64,linux/amd64 --progress plain --push --tag dokku/build-base:latest --tag dokku/build-base:0.0.1 -f contrib/build-base.Dockerfile .
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.