fix: Failed to open X display when restarting container (#790)

* Update docker-entrypoint.sh

fix error:

what(): Failed to open X display

by deleting the .X99-lock file at the start of the containe

* Update docker-entrypoint.sh

add check - if the file .X99-lock exists it will be removed. If not nothing is done.

* Update docker-entrypoint.sh

Change check and deletion to a one-liner

Author: a14stoner

docker-entrypoint.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 if ! which -- "${1}"; then
   # first arg is not an executable
+  if [ -e /tmp/.X99-lock ]; then rm /tmp/.X99-lock -f; fi
   export DISPLAY=:99
   Xvfb "${DISPLAY}" -nolisten unix &
   exec node /usr/src/app/ "$@"