[rawhide]: ext.config.docker.swarm-overlay-network fails on s390x

[nikita-dubrovskii]

Occured during bump-lockfile Jenkins job in version 45.20260508.91:

16:41:07  May 08 14:40:55 qemu0 kola-runext-swarm-overlay-network[2043]: + docker swarm init
16:41:07  May 08 14:40:57 qemu0 kola-runext-swarm-overlay-network[2043]: + docker network create --driver overlay --attachable testnetwork
16:41:07  May 08 14:40:57 qemu0 kola-runext-swarm-overlay-network[2043]: + docker run -t --network=testnetwork quay.io/fedora/fedora-minimal:44 curl https://icanhazip.com/
16:41:07  May 08 14:40:57 qemu0 kola-runext-swarm-overlay-network[2278]: Unable to find image 'quay.io/fedora/fedora-minimal:44' locally
16:41:07  May 08 14:40:58 qemu0 kola-runext-swarm-overlay-network[2278]: 44: Pulling from fedora/fedora-minimal
16:41:07  May 08 14:41:02 qemu0 kola-runext-swarm-overlay-network[2278]: Status: Downloaded newer image for quay.io/fedora/fedora-minimal:44
16:41:07  May 08 14:41:03 qemu0 kola-runext-swarm-overlay-network[2278]: curl: (6) Could not resolve host: icanhazip.com
16:41:07  May 08 14:41:03 qemu0 kola-runext-swarm-overlay-network[2043]: + fatal 'Docker swarm overlay working not functional. Test fails.'

Locally (s390x LPAR) wasn't able to reproduce:

$ cosa list
45.20260508.91.dev0
   Timestamp: 2026-05-08T13:37:51Z (1:10:07 ago)
   Artifacts: ostree oci-manifest qemu
      Config: 86c8955afd66147b693f3aa829c1b3127b5208a1

$ cosa kola run ext.config.docker.swarm-overlay-network 
=== RUN   ext.config.docker.swarm-overlay-network
--- PASS: ext.config.docker.swarm-overlay-network (35.01s)