Issue #1084: Embed podman binary on linux

Currently crc-embedder only embeds the podman binary on macOS. It's
intentionally not shippen on Windows because of
#1083
but there's no reason for not embedding it on Linux as we decided to
favour using a hand-picked release over relying on distro packages.

This fixes #1084

Author: cfergeau

cmd/crc-embedder/cmd/embed.go

@@ -96,6 +96,7 @@ var (
 		"linux": []string{
 			libvirt.MachineDriverDownloadUrl,
 			constants.GetOcUrlForOs("linux"),
+			constants.GetPodmanUrlForOs("linux"),
 		},
 		"windows": []string{
 			constants.GetOcUrlForOs("windows"),