Use /tmp as we need it anyway

Author: thespad

root/etc/s6-overlay/s6-rc.d/init-bookstack-config/run

@@ -43,10 +43,10 @@ echo "Waiting for DB to be available"
 END=$((SECONDS + 30))
 while [[ ${SECONDS} -lt ${END} ]] && [[ -n "${DB_HOST+x}" ]]; do
     if [[ $(/usr/bin/nc -w1 "${DB_HOST}" "${DB_PORT}" | tr -d '\0') ]]; then
-        if [[ ! -f /run/dbwait.lock ]]; then
+        if [[ ! -f /tmp/dbwait.lock ]]; then
             sleep 5
         fi
-        touch /run/dbwait.lock
+        touch /tmp/dbwait.lock
         break
     else
         sleep 1