[bootc] Do not capture /usr/lib/bootc/storage directory

[jcastill]

Add this directory to the forbidden path list
so we don't gather the images that could be
stored inside.

Related: SUPDEV-177

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[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo yum install -y dnf-plugins-core on RHEL 8
• sudo dnf install -y dnf-plugins-core on Fedora
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• And now you can install the packages.

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