Explicitly update locale and AppStream information

config/hooks/normal/01-set-locale.hook.chroot

@@ -0,0 +1,6 @@
+#!/bin/sh
+set -e
+
+cat >/etc/default/locale<<EOF
+LANG="C.UTF-8"
+EOF

config/hooks/normal/04-apt-appstream.hook.chroot

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -e
+
+# update APT metadata / DEP-11 YAML
+apt-get update
+
+if [ -e /usr/bin/appstreamcli ]
+then
+	/usr/bin/appstreamcli refresh --force --verbose
+fi