Workflow languages are programming languages. I'd be really interested to know if 1) there's a textual representation of the visual workflow design that you can easily export/import, and 2) the syntax and semantics of the language. I've seen a _lot_ of visual workflow editors which have a tendency towards limited expressiveness; there seems to be a major disconnect between the worlds of workflow authoring and programming.
I noticed that they provide the ability to specify a Dockerfile which contains the necessary facilities to run arbitrary code. But I can't help but think there has to be a middle ground between the two. I've written about this in the past, arguing that applying concepts from traditional programming language theory (in particular functional programming) to the design of workflow languages can be fruitful.
action "Deploy to Production" {
needs = "Provision Database"
uses = "actions/aws/ec2"
runs = "aws deploy --prod"
}