Add "run_command" Docker entrypoint option.

Used to run arbitrary Mayan management commands.

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

HISTORY.rst

@@ -151,6 +151,8 @@
 - Self-heal statistics results model when multiple
   results are created using the same slug value.
   Forum topic 1404.
+- Add "run_command" Docker entrypoint option to run arbitrary
+  Mayan management command.
 
 3.2.10 (2019-XX-XX)
 ===================

docker/rootfs/usr/local/bin/entrypoint.sh

@@ -145,6 +145,10 @@ run_celery)
     run_celery.sh "${@:2}"
     ;;
 
+run_command)
+    su mayan -c "${MAYAN_BIN} ${@:2}"
+    ;;
+
 run_frontend)
     run_frontend.sh
     ;;