rubygem-actionmailbox-6.1 from home:crameleon:LibertaCasa:Mastodon project

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For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:crameleon:LibertaCasa:Mastodon/15.4/home:crameleon:LibertaCasa:Mastodon.repo
zypper refresh
zypper install rubygem-actionmailbox-6.1