feat: add environment variable support and update README instructions

telegraf.conf

@@ -1,3 +1,7 @@
+[agent]
+    hostname = "${HOSTNAME}"
+    omit_hostname = false
+
 [[processors.dedup]]
     dedup_interval = "600s"
 
@@ -14,8 +18,7 @@
         [inputs.socket_listener.xpath.tags]
             url = "url"
             session = "session"
-            #id = ??
-            #state = ??
+            host = "host"
 
         [inputs.socket_listener.xpath.fields]
             player = "player"
@@ -26,8 +29,6 @@
     data_format = "json"
 
 [[outputs.mongodb]]
-    dsn = "mongodb://stats_user:%40z%5EVFhN7q%25vzit@192.168.86.120:27017/?authSource=statistics"
-    database = "statistics"
-    granularity = "seconds"
-
-#  docker run --rm -v .\peertube\statnerd\telegraf.conf:/etc/telegraf/telegraf.conf:ro -p 8094:8094/udp telegraf
+    dsn = "${DSN}"
+    database = "${DATABASE}"
+    granularity = "seconds"