$finder->find('grep') in Docker container returns NULL

[jverdeyen]

I'm running a sf2 application in Docker containers.

$finder->find('grep');

returns NULL.

$finder->find('/bin/grep')

Is working. So it's using the very slow finder search by default. I'm using a debian jessie container with a default php5-fpm installed.

Should I make PR where it's possible to explicit set the grep path, to solve this issue?