Merge "Make the `container` argument required for the `create-cache` subcommand." into main

        .subcommand(

            Command::new("create-cache")

                .arg(Arg::new("package").long("package").required(true))

                // TODO(b/312769710): Make this argument required.

                .arg(Arg::new("container").long("container"))

                .arg(Arg::new("container").long("container").required(true))

                .arg(Arg::new("declarations").long("declarations").action(ArgAction::Append))

                .arg(Arg::new("values").long("values").action(ArgAction::Append))

                .arg(