Docker image: first pull latest fedora
Docker image: first pull latest fedora

...because we always want the latest.

Also, remove unneeded `ln -s`; I placed it there in a futile attempt to
get the yajl-ruby gem to build properly on a linux/amd64 platform.

Nowadays I build the Docker image exclusively on M1/M2 Macs.

cunnie/deployments,cunnie/deployments