[atomic-wg] Issue #326: Require "dnf clean" equivalent in Container guidelines

[Stanislav Ochotnicky]

sochotni reported a new issue against the project: `atomic-wg` that you are following:
``
Currently container guidelines[1] have dnf clean in the template but they don't have it as a requirement. Due to size effect dnf cache has on containers I believe it should be required to clean. Maybe word it as a general requirement of:

Dockerfile *MUST* clean temporary files created within the container image during the build process to keep the size of container images small.

Or something of the sort

[1] https://fedoraproject.org/wiki/Container:Guidelines
``

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https://pagure.io/atomic-wg/issue/326