Issue in setting custom configuration files

[NadaMusthafa]

Describe the bug
There is an issue in specifying rules from a specific configuration file. How can we set linter to point to a custom configuration file?

To Reproduce
CSHARP_DOTNET_FORMAT :
      MEGALINTER_FILES_TO_LINT =
      ENABLE_LINTERS = CSHARP_DOTNET_FORMAT
      --
      CSHARP_DOTNET_FORMAT_CONFIG_FILE: '/config/.editorconfig'
      CSHARP_DOTNET_FORMAT_CLI_LINT_MODE: file

Expected behavior
It should lint all the changed files.

[nvuillam]

Duplicate of #3553 (we'll find a way, plz follow the main issue :) )