Docker image build Error : unable to find user admin: no matching entries in passwd file

here's how my Dockerfile look like :

[root@centos7 ~]# cat Dockerfile# syntax=docker/dockerfile:1#use centos imageFROM centos# Add none root userCMD  useradd admin && echo "admin:admin" CMD  chpasswdCMD  adduser admin sudoUSER admin#install python git and gcc libsRUN sudo yum install python3 python3-devel git gcc sassc redhat-rpm-config libxslt-devel  \    bzip2-devel openldap-devel libjpeg-devel freetype-devel

When I lunch the build of the image here's the error I encounter :

Step 6/24 : RUN sudo yum install python3 python3-devel git gcc sassc redhat-rpm-config libxslt-devel      bzip2-devel openldap-devel libjpeg-devel freetype-devel ---> Running in 4d6c76160178unable to find user admin: no matching entries in passwd file

anyone has an idea/suggestion why the user entry in the passwd file is not found ?