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Issue description

After Step 4.3 in the GE there is a NOTE that states "you can use the podman exec -ti nginx vim /etc/nginx/nginx.conf command to interactively modify the nginx.conf file with
the vim text editor."

This NOTE is correct only after running the `podman cp`.  If you run this as given in the NOTE, the learner will experience the error "Warning: Changing a readonly file" in vim when trying to make an edit.
 

Steps to reproduce:

[student@workstation ~]$ podman run -d -p 8080:8080 --name nginx registry.ocp4.example.com:8443/redhattraining/podman-nginx-helloworld
36a113a7a80e32ecc3704edb28df7f9702e22454cebf440abb525513409463cd

[student@workstation ~]$ podman exec -ti nginx vim /etc/nginx/nginx.conf

(Go into insert mode in vim)

– INSERT – W10: Warning: Changing a readonly file          

Alternatively, reproduce with:

[student@workstation ~]$ podman exec nginx ls -l /etc/nginx/nginx.conf
rw-rr-. 1 root root 2378 Apr 27  2022 /etc/nginx/nginx.conf
[student@workstation ~]$ podman exec nginx /bin/bash -c 'echo "#test" >> /etc/nginx/nginx.conf'
/bin/bash: /etc/nginx/nginx.conf: Permission denied

Workaround:

Either run with `-u root` or run a `podman cp` which will overwrite the ownership to be the default user (uid: 1001).

[student@workstation ~]$ podman exec -u root nginx /bin/bash -c 'echo "#test" >> /etc/nginx/nginx.conf'

[student@workstation ~]$ podman exec nginx tail -1 /etc/nginx/nginx.conf
#test

Another potential fix would be to modify the Containerfile which created this container image which has this in its history:

                    "created": "2022-04-27T13:20:30.030608287Z",
                    "created_by": "/bin/sh -c #(nop) ADD file:4b87f6e746c0d47288a18845c68e9f873c2e5f8031f4ef94ffc3b6dc918aa9b9 in /etc/nginx/nginx.conf "

You could then add a chown to be sure its editable by the root groups like was done for other paths:

                    "created_by": "/bin/sh -c touch /run/nginx.pid   && chgrp -R 0 /var/log/nginx /run/nginx.pid   && chmod -R g+rwx /var/log/nginx /run/nginx.pid /etc/nginx/nginx.conf"

Expected result:

Fix the NOTE to include the `-u root` option or fix the permissions on /etc/nginx/nginx.conf in the container image.