add dockerfile and fix trival bugs (#78)

docker/entrypoint.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+python rag/svr/task_broker.py &
+
+function task_exe(){
+  while [ 1 -eq 1 ];do mpirun -n 2 python rag/svr/task_executor.py ; done
+}
+
+function watch_broker(){
+  while [ 1 -eq 1];do
+    C=`ps aux|grep "task_broker.py"|grep -v grep|wc -l`;
+    if [ $C -lt 1 ];then
+      python rag/svr/task_broker.py &
+    fi
+    sleep 5;
+  done
+}
+
+
+task_exe &
+sleep 10;
+watch_broker &
+
+python api/ragflow_server.py