Add optional syslog logrus hook (#343)

* add optional syslog logrus hook

* document syslog

example/config.yaml

@@ -396,3 +396,28 @@ smtp-password: ""
 # Examples: ["mail@example.org"]
 # Default: ""
 smtp-from: ""
+
+#########################
+##### SYSLOG CONFIG #####
+#########################
+
+# Config for additional syslog log hooks. See https://en.wikipedia.org/wiki/Syslog,
+# and https://github.com/sirupsen/logrus/tree/master/hooks/syslog.
+#
+# These settings are useful when one wants to daemonize GoToSocial and send logs
+# to a specific place, either a local location or a syslog server. Most users will
+# not need to touch these settings.
+
+# Bool. Enable the syslog logging hook. Logs will be mirrored to the configured destination.
+# Options: [true, false]
+# Default: false
+syslog-enabled: false
+
+# String. Protocol to use when directing logs to syslog. Leave empty to connect to local syslog.
+# Options: ["udp", "tcp", ""]
+# Default: "tcp"
+syslog-protocol: "udp"
+
+# String. Address:port to send syslog logs to. Leave empty to connect to local syslog.
+# Default: "localhost:514"
+syslog-address: "localhost:514"