nitro-enclave-alive from Virtualization:Appliances:Staging project

需要 Fedora Rawhide ，用 root 執行：

dnf config-manager addrepo --from-repofile=https://download.opensuse.org/repositories/Virtualization:Appliances:Staging/Fedora_Rawhide/Virtualization:Appliances:Staging.repo
dnf install nitro-enclave-alive

需要 Fedora 39 ，用 root 執行：

dnf config-manager --add-repo https://download.opensuse.org/repositories/Virtualization:Appliances:Staging/Fedora_39/Virtualization:Appliances:Staging.repo
dnf install nitro-enclave-alive

需要 openSUSE Tumbleweed ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/Virtualization:Appliances:Staging/openSUSE_Tumbleweed/Virtualization:Appliances:Staging.repo
zypper refresh
zypper install nitro-enclave-alive

需要 openSUSE Leap 16.0 ，用 root 執行：

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