Set locale after it is generated by Puppet

Containerfile

@@ -7,15 +7,15 @@ ARG FACTER_makeopts
 ARG FEATURES
 ARG PROFILE
 
+RUN eix-sync -q
+
+# Configure locales and set up some conveniences
+RUN puppet agent --test --certname ci --environment main --tags nest::base::distcc,nest::base::locale,nest::base::portage,nest::base::puppet --logdir /var/log/puppet --rundir /var/run/puppet --vardir /var/lib/puppet --runtimeout 0; [ $? -eq 2 ]
+
 # Locale is managed by Puppet, but
 # it also needs to be persisted in the image.
 ENV LANG=en_US.UTF-8
 
-RUN eix-sync -q
-
-# Set up some conveniences
-RUN puppet agent --test --certname ci --environment main --tags nest::base::distcc,nest::base::portage,nest::base::puppet --logdir /var/log/puppet --rundir /var/run/puppet --vardir /var/lib/puppet --runtimeout 0; [ $? -eq 2 ]
-
 # Switch to desired profile and make the base system consistent with it,
 # breaking out of a possible circular dependency between mesa and libva.
 RUN eselect profile set "nest:${PROFILE}"