feat: support --quiet header when showing all environment variables
feat: support --quiet header when showing all environment variables

Closes #3229
progrium/dokku,dokku/dokku,alexquick/dokku,jimjag/dokku,alexquick/dokku,claytonbrown/dokku,claytonbrown/dokku,claytonbrown/dokku,progrium/dokku,jimjag/dokku,alexquick/dokku,claytonbrown/dokku,alexquick/dokku,jimjag/dokku,dokku/dokku,dokku/dokku,claytonbrown/dokku,alexquick/dokku,jimjag/dokku,progrium/dokku,jimjag/dokku,dokku/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,dokku/dokku,alexquick/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku,alexquick/dokku,dokku/dokku,jimjag/dokku,alexquick/dokku,jimjag/dokku,dokku/dokku,progrium/dokku,progrium/dokku,jimjag/dokku,claytonbrown/dokku