Getting Error while installing Tomcat 10

Hi,

I followed steps to install tomcat 10 on docker to create image butting getting error please see the details of the step and solve my problem

sudo docker pull ubunt
sudo docker run -it -d ubuntu
sudo docker exec -it cointainer_id /bin/bash
#apt-get -y install default-jdk
#groupadd tomcat
#useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat
# cd /tmp
#  wget https://downloads.apache.org/tomcat/tomcat-10/v10.0.0-M10/bin/apache-tomcat-10.0.0-M10.tar.gz
# mkdir /opt/tomcat
# tar xzvf apache-tomcat-*tar.gz -C /opt/tomcat --strip-components=1
#cd /opt/tomcat
#chgrp -R tomcat /opt/tomcat
#chmod -R g+r conf
#chmod g+x conf
# chown -R tomcat webapps/ work/ temp/ logs/
#nano /etc/systemd/system/tomcat.service

[Unit]
Description=Apache Tomcat Web Application Container
After=network.target

[Service]
Type=forking

Environment=JAVA_HOME=/usr/lib/jvm/java-1.11.0-openjdk-amd64
Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid
Environment=CATALINA_HOME=/opt/tomcat
Environment=CATALINA_BASE=/opt/tomcat
Environment='CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC'
Environment='JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom'

ExecStart=/opt/tomcat/bin/startup.sh
ExecStop=/opt/tomcat/bin/shutdown.sh

User=tomcat
Group=tomcat
UMask=0007
RestartSec=10
Restart=always

[Install]
WantedBy=multi-user.target
#systemctl daemon-reload

Got the following ERROR

System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down