docs: Use an open registry for images referenced in documentation

[No9]

Stepping through the documentation some of the repos required docker credentials in order to pull from them.

This is a suggestion to use an open registry such as quay.io or something so someone trying out the tech doesn't get blocked?

[tarastella]

Hi! Could you please tell me which documentation you are referring to? Is it the official podman one or this README?
This might be a silly answer, but have you looked at the section "Building your own container" on this README file?
There are a couple of quay.io repositories tested without authentication. I am currently maintaining one of those with base FreeBSD images. Let me know if you encounter an error.

[No9]

Opps Sorry wasn't that helpful a report
I'm referring to this one in the verification step https://podman.io/docs/installation#verification
podman run --rm docker.io/dougrabson/hello

[tarastella]

No worries :) and thanks for clarifying.
Perhaps @dfr can help with that.

[dfr]

I have roughly the same set of images in quay.io/dougrabson as well as docker.io/dougrabson. I will change the podman port's install message to reference quay.io instead of docker.io - perhaps you could make a PR in github.com/containers/podman.io to update the image there?

$ podman run --rm quay.io/dougrabson/hello
!... Hello Podman World ...!

         .--"--.
       / -     - \
      / (O)   (O) \
   ~~~| -=(,Y,)=- |
    .---. /`  \   |~~
 ~/  o  o \~~~~.----. ~~
  | =(X)= |~  / (O (O) \
   ~~~~~~~  ~| =(Y_)=-  |
  ~~~~    ~~~|   U      |~~

Project:   https://github.com/containers/podman
Website:   https://podman.io
Documents: https://docs.podman.io
Twitter:   @Podman_io

[alice-sowerby]

@No9 please would you close this issue once it's all done in the github.com/containers/podman.io repo? Thank you 🙏