Build a Docker image for Stunnel based on the instructions for Ubuntu

General
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Hello community,
I need to create a Docker image of Stunnel4. This is my first time attempting this; I’ve converted the Ubuntu instructions into the Dockerfile. However, after creating the image, the container doesn’t seem to launch

FROM ubuntu:latest

RUN apt-get update && apt-get install -y stunnel4  && apt-get -y install sudo

ADD stunnel.conf /etc/stunnel/stunnel.conf
ADD ldap-client.key /etc/stunnel/ldap-client.key
ADD ldap-client.crt /etc/stunnel/ldap-client.crt

RUN echo "ENABLED=1" | sudo tee -a /etc/default/stunnel4

EXPOSE 1636

CMD ["stunnel4", "/etc/stunnel/stunnel.conf"]
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And what is the error message? How do you start it?