add entrypoint

Author: dbarzin

docker/entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if ! whoami &> /dev/null; then
+  if [ -w /etc/passwd ]; then
+    echo "${USER_NAME:-default}:x:$(id -u):0:${USER_NAME:-default} user:${HOME}:/sbin/nologin" >> /etc/passwd
+  fi
+fi
+
+exec "$@"