Old releases are not deleted if colors is enabled for ls command

[ocean90]

• Deployer version: 7.1.3
• Deployment OS: macOS

I noticed that for a project the old releases were not deleted while keep_releases was set to 3. After some debugging I finally noticed that on the server we had ls aliased to ls --color=always. Because of this the array_map() in https://github.com/deployphp/deployer/blob/1bc90e84426059feb3a390283db6f2790e35d5a1/recipe/deploy/release.php#L39-L43 is producing an array with empty values:

array(32) {
  [0]=>
  string(4) ""
  [1]=>
  string(4) ""
  [2]=>
  string(4) ""
  [3]=>
  string(4) ""
  [4]=>

Before array_map() the output of $ll looks like:

As you can see the folder name is in color.

The current fix would be to remove the alias but I'm wondering if Deployer should prevent the colors by explicitly passing --color=none to ls?

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