Switch to use system node for PostGIS tests.
Switch to use system node for PostGIS tests.

florianf/tileoven,paulovieira/tilemill-clima,mbrukman/tilemill,paulovieira/tilemill-clima,mbrukman/tilemill,fxtentacle/tilemill,MappingKat/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,tilemill-project/tilemill,Zhao-Qi/tilemill,fxtentacle/tilemill,MappingKat/tilemill,florianf/tileoven,paulovieira/tilemill-clima,tizzybec/tilemill,nyimbi/tilemill,fxtentacle/tilemill,MappingKat/tilemill,isaacs/tilemill,MappingKat/tilemill,tizzybec/tilemill,nyimbi/tilemill,tilemill-project/tilemill,mbrukman/tilemill,paulovieira/tilemill-clima,tizzybec/tilemill,mbrukman/tilemill,tizzybec/tilemill,nyimbi/tilemill,Zhao-Qi/tilemill,Zhao-Qi/tilemill,Zhao-Qi/tilemill,MappingKat/tilemill,florianf/tileoven,tilemill-project/tilemill,nyimbi/tilemill,fxtentacle/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,tizzybec/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,Zhao-Qi/tilemill,isaacs/tilemill,fxtentacle/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,mbrukman/tilemill,isaacs/tilemill,nyimbi/tilemill,paulovieira/tilemill-clima