slugbuilder: Fix env_dir when running as slugbuilder user
slugbuilder: Fix env_dir when running as slugbuilder user

Fixes #247

Signed-off-by: Lewis Marshall <748e1641a368164906d4a0c0e3965345453dcc93@lmars.net>

felixrieseberg/flynn,whouses/flynn,tonicbupt/flynn,philiplb/flynn,josephglanville/flynn,TribeMedia/flynn,arekkas/flynn,clifff/flynn,TribeMedia/flynn,technosophos/flynn,shads196770/flynn,jzila/flynn,technosophos/flynn,TribeMedia/flynn,TribeMedia/flynn,benbjohnson/flynn,clifff/flynn,ozum/flynn,clifff/flynn,GrimDerp/flynn,shads196770/flynn,justintung/flynn,tonicbupt/flynn,shads196770/flynn,whouses/flynn,philiplb/flynn,felixrieseberg/flynn,schatt/flynn,TribeMedia/flynn,josephglanville/flynn,tonicbupt/flynn,benbjohnson/flynn,ozum/flynn,kgrz/flynn,felixrieseberg/flynn,shads196770/flynn,Brandywine2161/flynn,pkdevbox/flynn,jzila/flynn,felixrieseberg/flynn,benbjohnson/flynn,clifff/flynn,justintung/flynn,ozum/flynn,jzila/flynn,benbjohnson/flynn,flynn/flynn,Brandywine2161/flynn,lmars/flynn,arekkas/flynn,benbjohnson/flynn,pkdevbox/flynn,justintung/flynn,mubassirhayat/flynn,philiplb/flynn,josephglanville/flynn,schatt/flynn,tonicbupt/flynn,kgrz/flynn,josephglanville/flynn,ozum/flynn,clifff/flynn,clifff/flynn,ozum/flynn,philiplb/flynn,lmars/flynn,pkdevbox/flynn,arekkas/flynn,schatt/flynn,Brandywine2161/flynn,pkdevbox/flynn,GrimDerp/flynn,supermario/flynn,whouses/flynn,schatt/flynn,josephglanville/flynn,rikur/flynn,rikur/flynn,lmars/flynn,technosophos/flynn,GrimDerp/flynn,supermario/flynn,GrimDerp/flynn,supermario/flynn,shads196770/flynn,rikur/flynn,GrimDerp/flynn,mubassirhayat/flynn,flynn/flynn,Brandywine2161/flynn,technosophos/flynn,justintung/flynn,Brandywine2161/flynn,rikur/flynn,whouses/flynn,GrimDerp/flynn,ozum/flynn,kgrz/flynn,schatt/flynn,schatt/flynn,kgrz/flynn,whouses/flynn,philiplb/flynn,justintung/flynn,jzila/flynn,rikur/flynn,technosophos/flynn,pkdevbox/flynn,flynn/flynn,mubassirhayat/flynn,supermario/flynn,lmars/flynn,mubassirhayat/flynn,shutej/flynn,josephglanville/flynn,benbjohnson/flynn,supermario/flynn,kgrz/flynn,shads196770/flynn,jzila/flynn,tonicbupt/flynn,rikur/flynn,flynn/flynn,justintung/flynn,arekkas/flynn,kgrz/flynn,arekkas/flynn,whouses/flynn,felixrieseberg/flynn,Brandywine2161/flynn,lmars/flynn,pkdevbox/flynn,TribeMedia/flynn,flynn/flynn,supermario/flynn,jzila/flynn