[fix] cleanup server pid file on ungraceful shutdown in container

docker/files/entrypoint.sh

@@ -6,6 +6,7 @@
 prefix_file="${API_PREFIX_FILE:-/app/data/api_prefix}"
 db_file="${RAILS_DB_PATH:-/app/data/rynDNS.sqlite3}"
 default_admin_file="${API_DEFAULT_KEY_FILE:-/app/data/api_default_admin}"
+server_pid_file="${RAILS_PID_FILE:-/app/tmp/pids/server.pid}"
 rails_bin="${RAILS_BINARY:-/app/bin/rails}"
 demo_cycle="${RAILS_DEMO_RESET:-60m}"
 demo_prefix="zW3If4s5"
@@ -50,6 +51,15 @@ function random_sting()
   echo -n "$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w "${1:-32}" | head -n 1)"
 }
 
+function cleanup()
+{
+  if [ -f $server_pid_file ]; then
+    log WAR cleanup last server shutdown may have not been graceful
+    log cleanup deleting old server pid file    
+    rm $server_pid_file
+  fi
+}
+
 function get_prefix_file()
 {
   if [ -f "$prefix_file" ]; then
@@ -113,6 +123,7 @@ function db_setup()
 
 function main()
 {
+  cleanup
   set_api_prefix
   log main prefix: $RAILS_API_KEY_PREFIX
   db_setup