Remove -dev images, and fedora 38

This repository will focus on the distro-matched base images;
we'll use another repository for the COPR/dev stuff.

Fedora 38 is uninteresting as a target; our target will be ELN.

.github/workflows/ci.yml

@@ -27,10 +27,6 @@ jobs:
           variant: "-rt"
         - os: fedora
           version: eln
-        - os: fedora
-          variant: ""
-        - os: fedora
-          variant: "-dev"
 
     steps:
       - name: Checkout repository