Update Dockerfile

Dockerfile

@@ -1,6 +1,6 @@
 FROM debian:latest
 ARG DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && apt-get install -y passwd expect
+RUN apt-get update && apt-get install -y passwd expect gosu
 RUN useradd -m -u 1000 -s /bin/bash admin
 RUN echo 'admin:pass' | chpasswd
 RUN useradd -u 1001 1001 && echo '1001:pass' | chpasswd && echo 111
@@ -11,4 +11,4 @@ RUN chown -R 1000 /home && chmod -R 700 /home && chmod +x /home/admin/su.sh
 
 USER admin
 WORKDIR /home/admin
-CMD whoami && pwd && ls && (/home/admin/su.sh 1001 pass "whoami && pwd")
+CMD whoami && pwd && ls && (gosu 1001 "whoami && pwd")