Install grpc using gem command (ruby-grpc package has an unfixed regression)

debian/rake-tasks.sh

@@ -8,6 +8,10 @@ export DB RAILS_ENV
 
 cd /usr/share/gitlab
 
+# Workaround for #966653
+/usr/bin/gem install -v 1.30.2 grpc
+runuser -u ${gitlab_user} -- sh -c '/usr/bin/bundle install --local'
+
 # Check if the db is already present
 db_relations="$(LANG=C runuser -u postgres -- sh -c "psql gitlab_production -c \"\d\"" 2>&1)"
 if [ "$db_relations" = "No relations found." ] || \