ci: Fix platform specifier for podman
Due to freedesktop GitLab not providing public runners, @rafaelgieschke created our own Docker-based runner which behaves different from freedesktop's podman-based runners. This merge request fixes !227 (merged).
Platform specifiers have the format <os>|<arch>|<os>/<arch>[/<variant>]
(https://github.com/containerd/platforms/blob/9b464c3fab8b2cd7539ad01e827fd427a1c29a3e/platforms.go#L69).
Podman is more strict than docker in parsing and does not allow to specify
<arch>
only.
Signed-off-by: Michael Scherle michael.scherle@rz.uni-freiburg.de
Edited by Michael Scherle