@marin managed to get omnibus packages to build for our little Rpi2 
So, GitLab 7.10 will also officially support Rpi2. For the moment, grab the 7.9 package and test!
gitlab_7.9.0-omnibus.pi-1_armhf.deb
MD5 b64b5b0ee87e56c13eb36171ee375f34
Package was built on Raspbian GNU/Linux 7 (wheezy).
# Install dependencies
sudo apt-get install openssh-server
sudo apt-get install postfix
# Download the Omnibus package and install everything
wget https://s3-eu-west-1.amazonaws.com/downloads-packages/raspberry-pi/gitlab_7.9.0-omnibus.pi-1_armhf.deb
sudo dpkg -i gitlab_7.9.0-omnibus.pi-1_armhf.deb
# Configure and start GitLab
sudo gitlab-ctl reconfigure
Report any issues here and subscribe to the issue if you want to get any updates on the packaging process 
And some screens from inside rpi2.
