Merge pull request #34 from luke-jr/bugfix_noninteractive

Bugfix: Use noninteractive frontend for apt-get

bin/gbuild

@@ -84,7 +84,7 @@ def build_one_configuration(suite, arch, build_desc, reference_datetime)
   system! "on-target -u root apt-get update > var/install.log 2>&1"
 
   info "Installing additional packages (log in var/install.log)"
-  system! "on-target -u root apt-get -y install #{build_desc["packages"].join(" ")} > var/install.log 2>&1"
+  system! "on-target -u root DEBIAN_FRONTEND=noninteractive apt-get -y install #{build_desc["packages"].join(" ")} > var/install.log 2>&1"
 
   info "Grabbing package manifest"
   system! "on-target -u root bash < target-bin/grab-packages.sh > var/base-#{suitearch}.manifest"