feat(docker): disable pattern check

[badamowicz]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

# Title: feat(docker): disable pattern check for Dockerfiles
#  Allowed prefixs: dockerfile

Description

This PR addresses the issue mentioned in: #7541 (comment).
It's about having the possibility to disable the patterncheck for Dockerfiles. Therefore I added a new command line argument --ignore-dockerfile-pattern which only applies if also --file is given and the framework is dockerfile.
I'm not very happy with my solution because I am using an environment variable to disable the pattern. The reason I did it this way was that I found no better way to get the command line argument into the runner.
So if anybody can point me to a better way, this would be appreciated.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes