Error installing xcop inside a Docker container

[volodya-lombrozo]

@g4s8 We experience some problems when using xcop-action for our pipelines. xcop-action just fails during an installation step.
The error message:

ERROR:  Error installing xcop:
[81](https://github.com/objectionary/eo/actions/runs/3910262074/jobs/6682255756#step:2:81)
  	The last version of nokogiri (~> 1.10) to support your Ruby & RubyGems was 1.13.10. Try installing it with `gem install nokogiri -v 1.13.10` and then running the current command again
[82](https://github.com/objectionary/eo/actions/runs/3910262074/jobs/6682255756#step:2:82)
  	nokogiri requires Ruby version >= 2.7, < 3.3.dev. The current ruby version is 2.6.10.210.
[83](https://github.com/objectionary/eo/actions/runs/3910262074/jobs/6682255756#step:2:83)
  Successfully installed racc-1.6.2
[84](https://github.com/objectionary/eo/actions/runs/3910262074/jobs/6682255756#step:2:84)
  The command '/bin/sh -c gem install xcop' returned a non-zero code: 1

Full log right here

[g4s8]

@volodya-lombrozo try using some stable version to avoid docker building in GH actions, e.g. g4s8/xcop-action@1.0 instead of g4s8/xcop-action@master

[volodya-lombrozo]

@g4s8 It doesn't work. Please, have a look on that PR: objectionary/eo#1685
xcop-action still fails here (even if we use specific version 1.0).

[yegor256]

@g4s8 @volodya-lombrozo I believe, upgrading to Ruby 3.0 will solve the problem: https://github.com/g4s8/xcop-action/blob/master/Dockerfile#L1