I am interested in developing an Exercism track for Dyalog APL.
Myself and another have started work on the repo structure here GitHub - Dyalog/exercism: Repository to start an Exercism track for Dyalog APL. I wonder whether there is process in place to transfer this to the exercism organisation or whether you would prefer to create a new repository and we simply commit the files into that?
Then, should I create another thread to request a repository to implement the test runner?
This isn’t a direct answer to your question, but what would the hello-world exercise and test look like in Dyalog APL?
Take a look at the docs to acquaint yourself with general process of launching a new track. Make sure you (or the other people involved) are available and committed to supporting this new track, because It’ll likely need ongoing support, not only building it but also mentoring afterwards and etc.
One of the important thing to consider is the testing framework. Does your language have a testing framework? If not, are there 3rd party testing frameworks available? As @keiraville said, how would a hello-world exercise implementation work?