install_arch: Use the root_ssh role for adding authorized_key

The root_ssh_keys variable was changed in: ea9f114d ("root_ssh: Support giving root access to only some hosts") so let's just use the root_ssh role instead of maintaining the logic in two places.

added 5 commits

• 43b7b3c1...62561c6d - 4 commits from branch archlinux:master
• 56cb123c - install_arch: Use the root_ssh role for adding authorized_key

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approved this merge request

added 36 commits

• 56cb123c...aa37e4aa - 35 commits from branch archlinux:master
• 38890b43 - install_arch: Use the root_ssh role for adding authorized_key

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merged

mentioned in commit 94158499