Fix packages test script to use deb noninteractive (#93)

Author: straight-shoota

packages/support/test-install.sh

@@ -6,6 +6,9 @@ DISTRO_TYPE=""
 [[ -x "/usr/bin/apt-get" ]] && DISTRO_TYPE="deb"
 [[ -x "/usr/bin/yum" ]]     && DISTRO_TYPE="rpm"
 
+# Required for Ubuntu <= 20.04 to not ask for input during package installation
+export DEBIAN_FRONTEND=noninteractive
+
 ../scripts/install.sh
 crystal --version
 shards --version