[192] add github-actions with tflint

[pvlbnkl]

Link to main issue: provectus/swiss-army-kube#192

[pvlbnkl]

I'm using this example here: https://github.com/terraform-linters/tflint/blob/master/docs/user-guide/config.md

No idea why it doesn't ignore the module :(

[pvlbnkl]

finally exit code 2
Should I remove the unused variables?

[wallhided]

yeah, you can remove them, since they are unused