feat: Make logfile location customizable

It may be desirable to log to a more standard location (e.g. in /var/log/),
or in some cases to turn logging to file off. To support these, use a
custom config property to determine the location of the output log file,
and default to the previous location if it is unset.

server/.env.sample

@@ -6,6 +6,8 @@ SECRET_KEY=notsecretkey
 
 ## Optional
 
+# LOG_FILE=
+
 # TRUST_PROXY=0
 # TOKEN_EXPIRES_IN=365 # In days
 

server/utils/logger.js

@@ -6,7 +6,8 @@ const winston = require('winston');
  */
 const defaultLogTimestampFormat = 'YYYY-MM-DD HH:mm:ss';
 
-const logfile = `${process.cwd()}/logs/planka.log`;
+const logfile =
+  'LOG_FILE' in process.env ? process.env.LOG_FILE : `${process.cwd()}/logs/planka.log`;
 
 /**
  * Log level for both console and file log sinks.