feat(docker): Enable data for all provided tools that support system …

…locales

Dockerfile

@@ -7,11 +7,22 @@ FROM docker.io/library/archlinux:base-devel$ARCHTAG AS builder
 ARG RUNTIME_DEPS
 ARG BUILD_DEPS
 
+# Enable system locales for everything we have localizations for so tools like
+# `date` will output matching localized strings. By default Arch Docker images
+# have almost all locale data stripped out. This also makes it easier to
+# rebuild custom Docker images with extra languages supported.
+RUN sed -i -e '/^NoExtract.*locale/d' /etc/pacman.conf
+
 # Freshen all base system packages
 RUN pacman-key --init
 RUN pacman --needed --noconfirm -Syq archlinux-keyring
 RUN pacman --needed --noconfirm -Suq
 
+# Make sure *at least* glibc actually got reinstalled after enabling
+# extraaction of locale files even if the version was fresh so we can use the
+# locale support out of it later.
+RUN pacman --noconfirm -Sq glibc && yes | pacman -Sccq
+
 # Install run-time dependecies
 RUN pacman --needed --noconfirm -Sq $RUNTIME_DEPS $BUILD_DEPS
 
@@ -21,6 +32,10 @@ ARG REVISION
 COPY ./ /src
 WORKDIR /src
 
+# Rebuild locale database after having added our supported locales.
+RUN ls i18n/ | sed 's/[.-].*$/_/;s/^/^/' | sort -u | grep -Ef - /usr/share/i18n/SUPPORTED > /etc/locale.gen
+RUN locale-gen
+
 # GitHub Actions builder stopped providing git history :(
 # See feature request at https://github.com/actions/runner/issues/767
 RUN build-aux/docker-bootstrap.sh
@@ -40,6 +55,9 @@ ARG RUNTIME_DEPS
 ARG VERSION
 ARG REVISION
 
+# Set system locale to something other than 'C' that resolves to a real language
+ENV LANG=en_US.UTF-8
+
 # Freshen all base system packages (and cleanup cache)
 RUN pacman-key --init
 RUN pacman --needed --noconfirm -Syq archlinux-keyring && yes | pacman -Sccq