related PR: #79

We need to add YAML directories for YAML linter after the YAML directories have been determined.

https://github.com/envoyproxy/gateway/pull/79/files#diff-76ed074a9305c04054cdebb9e9aad2d818052b07091de1f20cad0bbac34ffb52R21