We've been using a Linux VM created by the importation of an OVA RhodeCode provided a while ago. Thank you guys!
Unfortunately, we ran out of space. I'm no Linux expert so I had to find a way out. Please let me share what I've learn.
Unlike the boot partition, the FileSystem is hosted on a LVM partition. The following post explain how to extend an LVM partition.
Personnaly, I didn't want to extend our Logical Volume on a new partition as proposed. I choosed to use GParted to increase the existing partition size and I used lvextend to increase our Logical Volume size. Then I use resize2fs so the FileSystem can see the available space.