less than symbol (<) not working correctly for CLI commands

[LimeBlast]

Describe the bug
We're setting up a subcommand which will automatically import a .sql file into mysql running inside a container. This contains the < symbol, as that required to import the dump, but this doesn't seem to work within the dip context.

To Reproduce
Steps to reproduce the behaviour:

# dip.yml
  mysql:
    description: Run mysql console
    service: mysql
    command: mysql -h mysql_no -u root -d app_development
    subcommands:
      import:
        description: import the specified file into the development database
        service: mysql
        command: mysql -h mysql -u root -proot app_development < MySQL.sql

# command run
$ dip mysql import

# Output
mysql: [Warning] Using a password on the command line interface can be insecure.
mysql  Ver 14.14 Distrib 5.7.33, for Linux (x86_64) using  EditLine wrapper
Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Usage: mysql [OPTIONS] [database]
  -?, --help          Display this help and exit.
  -I, --help          Synonym for -?
snip...

We've been able to bypass this by removing the < MySQL.sql portion of the command, and instead passing that in via the CLI when we run the command, i.e. dip mysql import < MySQL.sql - but would prefer for it to be all inclusive within the dip.yml file.

Expected behavior
It should import the database

Context (please complete the following information):

• OS: MacOS 11.1
• Version 6.1.0

[bibendi]

Yep, this is expected behavior.
We run a command through Process.exec

dip/lib/dip/command.rb

Line 13 in 1a06aa9

::Process.exec(env, cmd, *argv, options)

where arguments are passed as Array. And that's why we cannot use special symbols.
https://www.rubydoc.info/stdlib/core/Process.exec
Ruby invokes the command directly without the shell.
I'm trying to remember the reason why I choose that, but I can't :)
So, I need time to investigate it again, but I don't promise you that it will be fast because I little bit swamped on the current project.

[LimeBlast]

Does this mean we can define < symbols in the commands now?

[bibendi]

Yeap