Use C.UTF-8

The glibc 2.35-6 package ships with the C.UTF-8 locale included.
This means there is now a UTF-8 locale available by default and en_US.UTF-8, which requires editing /etc/locale.gen and running locale-gen, is not needed anymore.

Dockerfile.template

@@ -26,5 +26,5 @@ COPY --from=verify /rootfs/ /
 RUN ldconfig && \
     sed -i '/BUILD_ID/a VERSION_ID=TEMPLATE_VERSION_ID' /etc/os-release
 
-ENV LANG=en_US.UTF-8
+ENV LANG=C.UTF-8
 CMD ["/usr/bin/bash"]

Makefile

@@ -19,7 +19,6 @@ define rootfs
 	cp --recursive --preserve=timestamps --backup --suffix=.pacnew rootfs/* $(BUILDDIR)/
 
 	fakechroot -- fakeroot -- chroot $(BUILDDIR) update-ca-trust
-	fakechroot -- fakeroot -- chroot $(BUILDDIR) locale-gen
 	fakechroot -- fakeroot -- chroot $(BUILDDIR) sh -c 'pacman-key --init && pacman-key --populate archlinux && bash -c "rm -rf etc/pacman.d/gnupg/{openpgp-revocs.d/,private-keys-v1.d/,pubring.gpg~,gnupg.S.}*"'
 
 	ln -fs /usr/lib/os-release $(BUILDDIR)/etc/os-release

pacman-conf.d-noextract.conf

@@ -1,9 +1,10 @@
 [options]
-NoExtract  = usr/share/help/* !usr/share/help/en*
+NoExtract  = usr/share/help/* !usr/share/help/en* !usr/share/help/C/*
 NoExtract  = usr/share/gtk-doc/html/* usr/share/doc/*
 NoExtract  = usr/share/locale/* usr/share/X11/locale/* usr/share/i18n/*
 NoExtract   = !*locale*/en*/* !usr/share/i18n/charmaps/UTF-8.gz !usr/share/*locale*/locale.*
 NoExtract   = !usr/share/*locales/en_?? !usr/share/*locales/i18n* !usr/share/*locales/iso*
 NoExtract   = !usr/share/*locales/trans*
+NoExtract  = !usr/share/*locales/C !usr/share/*locales/POSIX !usr/share/i18n/charmaps/ANSI_X3.4-1968.gz
 NoExtract  = usr/share/man/* usr/share/info/*
 NoExtract  = usr/share/vim/vim*/lang/*

rootfs/etc/locale.conf

@@ -1 +1 @@
-LANG=en_US.UTF-8
+LANG=C.UTF-8

rootfs/etc/locale.gen

@@ -1 +0,0 @@
-en_US.UTF-8 UTF-8