core: if we change RLIMIT_NOFILE, reset it when executing commands

src/Command.zig

@@ -18,6 +18,7 @@ const Command = @This();
 
 const std = @import("std");
 const builtin = @import("builtin");
+const global_state = &@import("global.zig").state;
 const internal_os = @import("os/main.zig");
 const windows = internal_os.windows;
 const TempDir = internal_os.TempDir;
@@ -178,6 +179,10 @@ fn startPosix(self: *Command, arena: Allocator) !void {
     // If the user requested a pre exec callback, call it now.
     if (self.pre_exec) |f| f(self);
 
+    if (global_state.rlimits.nofile) |lim| {
+        internal_os.restoreMaxFiles(lim);
+    }
+
     // Finally, replace our process.
     _ = posix.execveZ(pathZ, argsZ, envp) catch null;