The Podman path in the dev gateway script references the
build:docker:supervisor-sideload mise task, which was removed in
d8b84773 ("feat(rpm): add RPM packaging with Packit/COPR and GHA
release publishing (#1126)"). That commit consolidated the sideload
and standalone supervisor image builds into a single
build:docker:supervisor task.
Update the reference so `mise run gateway` works with the Podman
compute driver.
Signed-off-by: Russell Bryant <russell.bryant@gmail.com>