podman build -t apimastery/asciibinder:ruby26 -f ./Containerfile
Then tag it for the destination image repository and push it. For example:
podman tag localhost/apimastery/asciibinder:ruby26 docker.io/apimastery/asciibinder:ruby26
podman rmi localhost/apimastery/asciibinder:ruby26
podman push docker.io/apimastery/asciibinder:ruby26