feat: add ldapauth for nginx

- add service, defaults and script

site/profiles/templates/ldapauth/nginx-ldap-auth.service.erb

@@ -0,0 +1,17 @@
+[Unit]
+Description=LDAP authentication helper for Nginx
+After=network.target network-online.target
+
+[Service]
+Type=simple
+User=<%= @user %>
+Group=<%= @group %>
+WorkingDirectory=/var/run
+EnvironmentFile=<%= @env_path %>
+ExecStart=<%= @bin_path %> $URL $BASE $BIND_DN $BIND_PASS $COOKIE $FILTER $REALM
+KillMode=process
+KillSignal=SIGINT
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target