ci: test on fedoradev again

Now that we have the image again.

Author: scop

.github/workflows/ci.yaml

@@ -84,9 +84,7 @@ jobs:
           - dist: debian10
             bsd: true
             network: none
-          # fedoradev disabled until we have the image,
-          # see .github/workflows/update-docker-images.yml
-          #- dist: fedoradev
+          - dist: fedoradev
           - dist: ubuntu14
     steps:
       - uses: actions/checkout@v2