Fix umask - get umask from environment

Makes it consistent with other linuxserver.io images.

readme-vars.yml

@@ -36,6 +36,7 @@ param_ports:
 param_usage_include_env: true
 param_env_vars:
   - { env_var: "TZ", env_value: "Europe/London", desc: "Specify a timezone to use EG Europe/London, this is required for Sonarr"}
+  - { env_var: "UMASK_SET", env_value: "022", desc: "control permissions of files and directories created by Sonarr"}
 
 # application setup block
 app_setup_block_enabled: true

root/etc/services.d/sonarr/run

@@ -1,6 +1,8 @@
 #!/usr/bin/with-contenv bash
 
-umask 022
+UMASK_SET=${UMASK_SET:-022}
+
+umask "$UMASK_SET"
 
 cd /opt/NzbDrone || exit