fix: modify socket file permissions so that APISIX has permission to …

…read and write (#96)

Co-authored-by: 刘朋 <peng1.liu@beantechs.com>

runner-core/src/main/java/org/apache/apisix/plugin/runner/server/ApplicationRunner.java

@@ -83,5 +83,6 @@ public void run(String... args) throws Exception {
         awaitThread.setDaemon(false);
         awaitThread.setName("uds-server");
         awaitThread.start();
+        Runtime.getRuntime().exec("chmod 777 " + socketFile);
     }
 }