fix rootfs propagation mode

Signed-off-by: Yusuke Sakurai <yusuke.sakurai@3-shake.com>

tests/integration/mounts_propagation.bats

@@ -0,0 +1,22 @@
+#!/usr/bin/env bats
+
+load helpers
+
+function setup() {
+	requires root
+	setup_debian
+}
+
+function teardown() {
+	teardown_bundle
+}
+
+@test "runc run [rootfsPropagation shared]" {
+	update_config ' .linux.rootfsPropagation = "shared" '
+
+	update_config ' .process.args = ["findmnt", "--noheadings", "-o", "PROPAGATION", "/"] '
+
+	runc run test_shared_rootfs
+	[ "$status" -eq 0 ]
+	[ "$output" = "shared" ]
+}