Update .gitpod.Dockerfile

As per feedback from gitpod on ticket: gitpod-io/gitpod#8487

Author: sermiribrahim

.gitpod.Dockerfile

@@ -7,7 +7,7 @@ RUN echo "* soft nproc 20000\n"\
 
 #Simple example on how to extend the image to install Java and maven
 RUN apt-get -qq update && \
-     apt-get install -yq maven default-jdk sudo
+     apt-get install -yq maven default-jdk sudo git
 
 RUN chmod -R g+rwX /opt/couchbase && \
      addgroup --gid 33333 gitpod && \