Add systemd-networkd config templates

systemd/network/template.10-myonlyether.link

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+[Match]
+MACAddress = 00:11:22:33:44:55
+
+[Link]
+Name = myonlyether
+Description = My only ethernet port on this computer

systemd/network/template.20-wired.network

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+[Match]
+Name = myonlyether
+
+[Network]
+Address = 192.168.0.98/24
+Gateway = 192.168.0.1
+# Cloudflare dns
+DNS = 1.1.1.1

systemd/resolved.conf

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+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it under the
+#  terms of the GNU Lesser General Public License as published by the Free
+#  Software Foundation; either version 2.1 of the License, or (at your option)
+#  any later version.
+#
+# Entries in this file show the compile time defaults. Local configuration
+# should be created by either modifying this file, or by creating "drop-ins" in
+# the resolved.conf.d/ subdirectory. The latter is generally recommended.
+# Defaults can be restored by simply deleting this file and all drop-ins.
+#
+# Use 'systemd-analyze cat-config systemd/resolved.conf' to display the full config.
+#
+# See resolved.conf(5) for details.
+
+[Resolve]
+DNS = 1.1.1.1
+FallbackDNS = 1.0.0.1
+# Some examples of DNS servers which may be used for DNS= and FallbackDNS=:
+# Cloudflare: 1.1.1.1#cloudflare-dns.com 1.0.0.1#cloudflare-dns.com 2606:4700:4700::1111#cloudflare-dns.com 2606:4700:4700::1001#cloudflare-dns.com
+# Google:     8.8.8.8#dns.google 8.8.4.4#dns.google 2001:4860:4860::8888#dns.google 2001:4860:4860::8844#dns.google
+# Quad9:      9.9.9.9#dns.quad9.net 149.112.112.112#dns.quad9.net 2620:fe::fe#dns.quad9.net 2620:fe::9#dns.quad9.net
+#DNS=
+#FallbackDNS=1.1.1.1#cloudflare-dns.com 9.9.9.9#dns.quad9.net 8.8.8.8#dns.google 2606:4700:4700::1111#cloudflare-dns.com 2620:fe::9#dns.quad9.net 2001:4860:4860::8888#dns.google
+#Domains=
+#DNSSEC=no
+#DNSOverTLS=no
+#MulticastDNS=yes
+#LLMNR=yes
+#Cache=yes
+#CacheFromLocalhost=no
+#DNSStubListener=yes
+#DNSStubListenerExtra=
+#ReadEtcHosts=yes
+#ResolveUnicastSingleLabel=no

systemd/system/systemd-networkd-wait-online.service.d/wait-for-only-ethernet.conf

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+[Service]
+ExecStart =
+ExecStart = /usr/lib/systemd/systemd-networkd-wait-online -i enp4s0