install xq on build server and use in hudson's crontab to clean workspace of disables jobs

configuration/environments_scripts/build_server/setup-hudson-server.sh

@@ -26,6 +26,8 @@ else
     if ! build_crontab_and_setup_files build_server; then
         exit 1
     fi
+    # Install "xq" which is used by a hudson cron job to clean up workspaces of disabled jobs:
+    curl -sSL https://bit.ly/install-xq | sudo bash
     # Make eu-west-1 the default region for any aws CLI interaction:
     sudo su - -c "aws configure set default.region eu-west-1"
     # Clear "hudson" user's directory again which is to become a mount point

configuration/environments_scripts/build_server/users/hudson/crontab-clean-workspace-of-disabled-jobs

@@ -0,0 +1 @@
+23 3 * * *      export PATH=${PATH}:/usr/local/bin; for i in /home/hudson/repo/jobs/*; do if [ "$( xq -x /project/disabled ${i}/config.xml 2>/dev/null )" = "true" ]; then rm -rf "${i}/workspace"; fi; done