allow DEBUG env variable to be used

makes it easier to turn on debugging in production without changing the config

modules/config.example.js

@@ -1,23 +1,23 @@
 var config = {
-  min_size: 1,                   // for avatars
-  max_size: 512,                 // for avatars; too big values might lead to slow response time or DoS
-  default_size: 160,             // for avatars; size to be used when no size given
-  min_scale: 1,                  // for renders
-  max_scale: 10,                 // for renders; too big values might lead to slow response time or DoS
-  default_scale: 6,              // for renders; scale to be used when no scale given
-  local_cache_time: 1200,        // seconds until we will check if the image changed. should be > 60 to prevent mojang 429 response
-  browser_cache_time: 3600,      // seconds until browser will request image again
-  cleaning_interval: 1800,       // seconds interval: deleting images if disk size at limit
-  cleaning_disk_limit: 10240,    // min allowed available KB on disk to trigger cleaning
-  cleaning_redis_limit: 24576,   // max allowed used KB on redis to trigger redis flush
-  cleaning_amount: 50000,        // amount of avatar (and their helm) files to clean
-  http_timeout: 1000,            // ms until connection to mojang is dropped
-  debug_enabled: false,          // enables logging.debug
-  faces_dir: "images/faces/",    // directory where faces are kept. should have trailing "/"
-  helms_dir: "images/helms/",    // directory where helms are kept. should have trailing "/"
-  skins_dir: "images/skins/",    // directory where skins are kept. should have trailing "/"
-  renders_dir: "images/renders/",// Directory where rendered skins are kept. should have trailing "/"
-  capes_dir: "images/capes/",    // directory where capes are kept. should have trailing "/"
+  min_size: 1,                                          // for avatars
+  max_size: 512,                                        // for avatars; too big values might lead to slow response time or DoS
+  default_size: 160,                                    // for avatars; size to be used when no size given
+  min_scale: 1,                                         // for renders
+  max_scale: 10,                                        // for renders; too big values might lead to slow response time or DoS
+  default_scale: 6,                                     // for renders; scale to be used when no scale given
+  local_cache_time: 1200,                               // seconds until we will check if the image changed. should be > 60 to prevent mojang 429 response
+  browser_cache_time: 3600,                             // seconds until browser will request image again
+  cleaning_interval: 1800,                              // seconds interval: deleting images if disk size at limit
+  cleaning_disk_limit: 10240,                           // min allowed available KB on disk to trigger cleaning
+  cleaning_redis_limit: 24576,                          // max allowed used KB on redis to trigger redis flush
+  cleaning_amount: 50000,                               // amount of avatar (and their helm) files to clean
+  http_timeout: 1000,                                   // ms until connection to mojang is dropped
+  debug_enabled: process.env.DEBUG === "true" || false, // enables logging.debug
+  faces_dir: "images/faces/",                           // directory where faces are kept. should have trailing "/"
+  helms_dir: "images/helms/",                           // directory where helms are kept. should have trailing "/"
+  skins_dir: "images/skins/",                           // directory where skins are kept. should have trailing "/"
+  renders_dir: "images/renders/",                       // Directory where rendered skins are kept. should have trailing "/"
+  capes_dir: "images/capes/",                           // directory where capes are kept. should have trailing "/"
 };
 
 module.exports = config;