fix config location and remove unused config_path env

.env.sample

@@ -4,6 +4,8 @@ DOMAIN=privatebin.example.com
 
 LETS_ENCRYPT_ENV=production
 
+PB_INSTANCE_NAME=PrivateBin
+
 PB_DISCUSSIONS_ENABLE=true
 PB_DISCUSSIONS_TIMECODE_COMMENTS=false
 PB_PASSWORD_ENABLE=true

compose.yml

@@ -6,14 +6,13 @@ services:
     image: privatebin/nginx-fpm-alpine:1.7.6
     configs:
       - source: php_config
-        target: /cfg/conf.php
+        target: /srv/cfg/conf.php
       - source: robots
         target: /var/www/robots.txt
     networks:
       - proxy
     read_only: true
     environment:
-      - CONFIG_PATH=/cfg/conf.php
       - PB_PUBLIC_DIRECTORY
     deploy:
       restart_policy: