Added "rootfs" feature.

src/ruby/nxt_ruby.c

@@ -7,6 +7,7 @@
 
 #include <nxt_unit.h>
 #include <nxt_unit_request.h>
+#include <nxt_ruby_mounts.h>
 
 
 #define NXT_RUBY_RACK_API_VERSION_MAJOR  1
@@ -78,6 +79,10 @@ NXT_EXPORT nxt_app_module_t  nxt_app_module = {
     compat,
     nxt_string("ruby"),
     ruby_version,
+#if (NXT_HAVE_ISOLATION_ROOTFS)
+    nxt_ruby_mounts,
+    nxt_nitems(nxt_ruby_mounts),
+#endif
     NULL,
     nxt_ruby_start,
 };