Console backend's log format should be prefixed and suffixed with newlines.

This is how upstream does it by default.

config/config.exs

@@ -181,7 +181,7 @@
 # Configures Elixir's Logger
 config :logger, :console,
   level: :debug,
-  format: "$time $metadata[$level] $message\n",
+  format: "\n$time $metadata[$level] $message\n",
   metadata: [:request_id]
 
 config :logger, :ex_syslogger,

config/test.exs

@@ -17,7 +17,7 @@
 # Print only warnings and errors during test
 config :logger,
   level: :warn,
-  format: "[$level] $message"
+  format: "\n[$level] $message\n"
 
 config :pleroma, :auth, oauth_consumer_strategies: []