Access Docker image registry via HTTP?

[Time0o]

I am running a Docker registry inside the same cluster as my action runners. I assume this is the default setup since downloading images on every run is not feasible with ephemeral runners. However, I could not figure out how to allow pulling images via HTTP (I don't want to set up HTTPS for my local registry for no real reason), the workflows fail with:

Error response from daemon: Get "https://arc-docker-registry:5000/v2/": http: server gave HTTP response to HTTPS client

How do I do this?