Write v2 registries.conf in CI setup

On the CI the registries.conf in v1 format. Since we update the go
binding for podman, podman bindings reject v1 for any image operation,
causing EnsureImage calls to fail.

Assisted-by: AI
Signed-off-by: Alice Frosi <afrosi@redhat.com>

Author: alicefr

.github/actions/setup-bink/action.yml

@@ -56,6 +56,7 @@ runs:
         printf '[containers]\napparmor_profile = "unconfined"\nseccomp_profile = "/etc/containers/seccomp.json"\n' | sudo tee /etc/containers/containers.conf
         grep -q '^root:' /etc/subuid || echo 'root:100000:65536' | sudo tee -a /etc/subuid
         grep -q '^root:' /etc/subgid || echo 'root:100000:65536' | sudo tee -a /etc/subgid
+        printf 'unqualified-search-registries = ["docker.io"]\n' | sudo tee /etc/containers/registries.conf
         sudo systemctl start podman.socket
         sudo podman info --format '{{.Store.GraphRoot}}'