The dokku droplet as installed has a problem with the ruby buildpack, which depends on a nodejs.org download that has recently 301’d. This means no ruby apps are deployable.
It looks like dokku in the droplet wasn’t installed using debian packages, which is the recommended way to run dokku now.
What’s the easiest way to upgrade dokku so I can deploy again?
These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.