docker: Add Dockerfile for multi-platforms.

docker/entrypoint.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+if [ -f /opt/spt-server/SPT.Server ]; then
+  appHash=$(md5sum /app/spt-server/SPT.Server | awk '{ print $1 }')
+  optHash=$(md5sum /opt/spt-server/SPT.Server | awk '{ print $1 }')
+  if [ "$appHash" = "$optHash" ]; then
+    echo "MD5 verification successful!"
+  else
+    echo "MD5 mismatch, copy files to /opt/spt-server."
+    cp -r /app/spt-server /opt
+    echo "Finished!"
+  fi
+else
+  echo "Program is not found, copy files to /opt/spt-server."
+  cp -r /app/spt-server /opt
+  echo "Finished!"
+fi
+
+cd /opt/spt-server
+
+if [ -z "$backendIp" ]; then
+  IP=$(hostname -I | awk '{print $1}')
+else
+  IP=$backendIp
+fi
+
+if [ -z "$backendPort" ]; then
+  PORT=6969
+else
+  PORT=$backendPort
+fi
+
+sed -i "0,/127.0.0.1/s/127.0.0.1/${IP}/" SPT_Data/Server/configs/http.json
+sed -i "s/6969/${PORT}/g" SPT_Data/Server/configs/http.json
+
+chmod +x SPT.Server && ./SPT.Server
+