Manual installation
===================
* Create user sshca:
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useradd --system --no-user-group --shell /bin/sh --create-home --home-dir /srv/sshca sshca
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* Create directories:
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install -o sshca -m 0700 -d ~sshca/bin ~sshca/.local ~sshca/.local/sshca ~sshca/.local/sshca/pubs
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* Copy `ssh-ca` script:
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install -o sshca -m 0700 -t ~sshca/bin ssh-ca
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* Create `authorized_keys`:
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touch emptyfile
install -o sshca -m 0700 emptyfile ~sshca/.ssh/authorized_keys
rm emptyfile
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* Create serial-file:
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echo 0 > serial
install -o sshca -m 0600 serial ~sshca/.local/sshca
rm serial
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* Create CA (no password):
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ssh-keygen -t ed25519 -C "CA" -N '' -f ~sshca/.local/sshca/ca
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