CI: gettext is required by compilemessages

.gitlab-ci.yml

@@ -36,7 +36,7 @@ install_environment:
     - mkdir -p "${APT_STATE_LISTS}/partial"
     - mkdir -p "${APT_CACHE_ARCHIVES}/partial"
     - apt update -qy
-    - apt install -y apt-utils curl postgresql postgresql-contrib libgdal-dev make
+    - apt install -y apt-utils curl postgresql postgresql-contrib libgdal-dev make gettext
     - export PGPASSWORD=$POSTGRES_PASSWORD
     - psql --username $POSTGRES_USER --host $HOST -d $POSTGRES_DB -c "ALTER ROLE anthology_django SET client_encoding TO 'utf8';"
     - psql --username $POSTGRES_USER --host $HOST -d $POSTGRES_DB -c "ALTER ROLE anthology_django SET default_transaction_isolation TO 'read committed';"