fix .gitignore rules

.gitignore

@@ -1,4 +1,4 @@
 *.deb
 *tar.gz
 md5sums
-files/
+./files/

coredns/files/etc/coredns/Corefile

@@ -0,0 +1,9 @@
+# Default Corefile, see https://coredns.io for more information.
+
+# Answer every below the root, with the whoami plugin. Log all queries
+# and errors on standard output.
+. {
+    whoami  # coredns.io/plugins/whoami
+    log     # coredns.io/plugins/log
+    errors  # coredns.io/plugins/errors
+}

coredns/files/lib/systemd/system/coredns.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=CoreDNS DNS server
+Documentation=https://coredns.io
+After=network.target
+
+[Service]
+PermissionsStartOnly=true
+LimitNOFILE=1048576
+LimitNPROC=512
+CapabilityBoundingSet=CAP_NET_BIND_SERVICE
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+NoNewPrivileges=true
+User=coredns
+WorkingDirectory=~
+ExecStart=/usr/bin/coredns -conf=/etc/coredns/Corefile
+ExecReload=/bin/kill -SIGUSR1 $MAINPID
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target