Available versions
------------------
- etcd-3.2
- etcd-3.3
- etcd-3.4
- etcd-3.5
- etcd-3.6


Installing from repo:
---------------------

    sudo sh -c 'cat >/etc/apt/sources.list.d/osso-ppa-etcd.list' <<EOF
deb [signed-by=/etc/apt/keyrings/osso-ppa-k8s.gpg] http://ppa.osso.nl/etcd-3.2 anydist main
EOF

    sudo apt-get update
    # (yields: public key is not available: NO_PUBKEY 9EFF7D67F1DB3DD2)

    sudo wget -qO /etc/apt/keyrings/osso-ppa-k8s.gpg https://ppa.osso.nl/support+ppa-k8s@osso.nl.gpg
    sha256sum /etc/apt/keyrings/osso-ppa-k8s.gpg | sed -e 's/\(......\)/\1 /g;s/  .*//'
    # yields: c1cfca ead5eb 2d8714 f48703 a7bea3 5aa948 fbd91f d0cc1e 00bb9b 120047 1c4f

    sudo apt-get update

    sudo apt-get install etcd