Without this, building Dokku on a newer operating system will result in binaries that do not work on older systems. The environment variables were only being set when building in docker, which has not been used in the release workflow for a while.
This fixes an issue where the post-release-builder trigger inadvertently modifies the image. We take advantage of the fact that env vars are available at the `pre-release-builder` phase to ensure any image modifications occur as appropriate.
This change converts existing CHECKS files into a healthchecks key that is understood by 'docker-container-healthchecker'. This tool supports a number of different types of container healthchecks - command, http, uptime - and can perform healthchecks against non-web processes.
The use of the old CHECKS file is now deprecated, and will be removed in the next minor version. Users can use the 'docker-container-healthchecker' to convert existing CHECKS files to the new format automatically.
Closes#2760
This functionality enables users to manage a global crontab for the Dokku user that contains all scheduled tasks across all apps. Alternative schedulers can implement cron tasks as desired.
