support test usecase to not put logs in /var/log

src/config.js

@@ -2,6 +2,7 @@
 
 exports = module.exports = {
     baseDir: baseDir,
+    logDir: logDir,
 
     // values set here will be lost after a upgrade/update. use the sqlite database
     // for persistent values that need to be backed up
@@ -61,6 +62,11 @@ function baseDir() {
     if (exports.TEST) return path.join(homeDir, '.cloudron_test');
 }
 
+function logDir() {
+    if (exports.CLOUDRON) return '/var/log';
+    if (exports.TEST) return path.join(homeDir, '.cloudron_test', 'log');
+}
+
 var cloudronConfigFileName = path.join(baseDir(), 'configs/cloudron.conf');
 
 // only tests can run without a config file on disk, they use the defaults with runtime overrides