[pungi-fedora] PR #511: Fix permissions on grub output so the world can read it

[Patrick "マルタインアンドレアス" Uiterwijk]

puiterwijk opened a new pull-request against the project: `pungi-fedora` that you are following:
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Fix permissions on grub output so the world can read it
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https://pagure.io/pungi-fedora/pull-request/511