feat: add minimal atlas step to the build

This contribution is part of the [FC-0012 project](https://openedx.atlassian.net/l/cp/XGS0iCcQ) which is sparked by the [Translation Infrastructure update OEP-58](https://open-edx-proposals.readthedocs.io/en/latest/architectural-decisions/oep-0058-arch-translations-management.html#specification).

tutordiscovery/templates/discovery/build/discovery/Dockerfile

@@ -6,7 +6,7 @@ ENV DEBIAN_FRONTEND=noninteractive
 RUN {% if is_buildkit_enabled() %}--mount=type=cache,target=/var/cache/apt,sharing=locked \
     --mount=type=cache,target=/var/lib/apt,sharing=locked{% endif %} \ 
     apt update && \
-    apt install -y curl git-core language-pack-en python3 python3-pip python3-venv \
+    apt install -y curl git-core gettext language-pack-en python3 python3-pip python3-venv \
     build-essential libcairo2 libffi-dev libmysqlclient-dev libxml2-dev libxslt-dev libjpeg-dev libssl-dev
 ENV LC_ALL en_US.UTF-8
 
@@ -60,7 +60,14 @@ RUN {% if is_buildkit_enabled() %}--mount=type=cache,target=/openedx/.cache/pip,
     # Use redis as a django cache https://pypi.org/project/django-redis/
     django-redis==5.2.0 \
     # uwsgi server https://pypi.org/project/uWSGI/
-    uwsgi==2.0.21
+    uwsgi==2.0.21 \
+    # Open edX Atlas tranlsation management tool https://pypi.org/project/openedx-atlas/
+    openedx-atlas==0.4.4
+
+# Update i18n: the equivalent of "make pull_translations"
+RUN find course_discovery/conf/locale -type d -mindepth 1 -maxdepth 1 -exec rm -rf {} + # Remove stale translation files
+RUN atlas pull -v {{ patch("atlas-extra-args") }} translations/course-discovery/course_discovery/conf/locale:course_discovery/conf/locale
+RUN python manage.py compilemessages
 
 # Collect static assets
 COPY --chown=app:app assets.py ./course_discovery/settings/assets.py