Secrets cannot be saved on bitrise.io when a value is empty.
As a workaround we can only enable value expansion and use non-existent environment variable as an input.
Use case / for what or how I would use it
Analogous to those when empty environment variable is distinguished from not set one.
@koral Could you help me understand this a bit better by providing an example of how you treat an empty secret and a non-existent secret differently in your workflows?