libpod: ensure we are not killed during netns creation

When we are killed during netns setup it will leak the netns path as it
was not commited in the db. This is rather common if you run systemctl
stop on a podman systemd unit. Of course we cannot protect against
SIGKILL but in systemd case we get SIGTERM and we really should not exit
in a critical section like this.

Fixes #24044

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

libpod/container_internal_linux.go

@@ -19,6 +19,7 @@ import (
 	"github.com/containers/common/pkg/cgroups"
 	"github.com/containers/common/pkg/config"
 	"github.com/containers/podman/v5/libpod/define"
+	"github.com/containers/podman/v5/libpod/shutdown"
 	"github.com/containers/podman/v5/pkg/rootless"
 	spec "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/opencontainers/runtime-tools/generate"
@@ -67,6 +68,9 @@ func (c *Container) prepare() error {
 		tmpStateLock                    sync.Mutex
 	)
 
+	shutdown.Inhibit()
+	defer shutdown.Uninhibit()
+
 	wg.Add(2)
 
 	go func() {