groundStation: Add qmake-qt5 to docker image

.gitlab-ci.yml

 image: ruby:2.3
 
 before_script:
-  - apt-get update -qq && apt-get install -y -qq libbluetooth-dev cmake valgrind
+  - apt-get update -qq && apt-get install -y -qq libbluetooth-dev cmake valgrind qmake-qt5
 
 stages:
   - build