Problem matcher picks up issues that were ignored in the config file

[lukasz-mitka]

Scenario:

1. Create config file with some ignores
2. Have a Dockerfile with some issues that should be ignored.
3. Run hadolint/hadolint-action
4. Job succeeds as findings are ignorred
5. hadolint still prints findings to stdout
6. Problem matcher picks them up and reports as error in GitHub UI

It's inconsistent and can be misleading. I'd like that problem matcher would skip the ignored findings.
Would require change to problem matcher or maybe hadolint.