podman: new option --preserve-fd

add a new option --preserve-fd that allows to specify a list of FDs to
pass down to the container.

It is similar to --preserve-fds but it allows to specify a list of FDs
instead of the maximum FD number to preserve.

--preserve-fd and --preserve-fds are mutually exclusive.

It requires crun since runc would complain if any fd below
--preserve-fds is not preserved.

Closes: https://github.com/containers/podman/issues/20844

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

pkg/domain/entities/containers.go

@@ -297,6 +297,7 @@ type ExecOptions struct {
 	Interactive bool
 	Latest      bool
 	PreserveFDs uint
+	PreserveFD  []uint
 	Privileged  bool
 	Tty         bool
 	User        string
@@ -360,6 +361,7 @@ type ContainerRunOptions struct {
 	InputStream  *os.File
 	OutputStream *os.File
 	PreserveFDs  uint
+	PreserveFD   []uint
 	Rm           bool
 	SigProxy     bool
 	Spec         *specgen.SpecGenerator