Use -qq flag on apt-get to quiet installations of packages

tests/ci/setup.sh

@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 set -eo pipefail
 
-export DEBIAN_FRONTEND=noninteractive 
-apt-get install -y git make curl
+export DEBIAN_FRONTEND=noninteractive
+apt-get install -qq -y git make curl
 
 cd /tmp
 
@@ -24,4 +24,4 @@ EOF
 cat<<EOF > /etc/rc.local
 curl https://raw.github.com/progrium/dokku/master/tests/ci/receiver -s > /tmp/receiver
 chmod +x /tmp/receiver
-EOF
+EOF