fix Jellyfin custom env variables overriding jellyfin internal vars

Jellyfin/docker-compose.yaml

@@ -12,8 +12,8 @@ services:
       - ${JELLYFIN_PORT_HTTP}:8096
       - ${JELLYFIN_PORT_HTTPS}:8920
     volumes:
-      - ${JELLYFIN_CONFIG_DIR}:/cache
-      - ${JELLYFIN_CACHE_DIR}:/config:r
+      - ${JELLYFIN_CONFIG_DIR_}:/cache
+      - ${JELLYFIN_CACHE_DIR_}:/config:r
       - nas-drive:/data/media:ro
     env_file:
       - stack.env
@@ -23,4 +23,4 @@ volumes:
     driver_opts:
       type: cifs
       o: username=${SAMBA_USERNAME},password=${SAMBA_PASSWORD},vers=3.0
-      device: ${JELLYFIN_DATA_DIR}
+      device: ${JELLYFIN_DATA_DIR_}

Jellyfin/stack.env

@@ -3,8 +3,8 @@ PGID=1000
 TZ=America/Toronto
 JELLYFIN_PORT_HTTP=8096
 JELLYFIN_PORT_HTTPS=8920
-JELLYFIN_CONFIG_DIR=/home/portainer/jellyfin/config
-JELLYFIN_CACHE_DIR=/home/portainer/jellyfin/cache
-JELLYFIN_DATA_DIR=
+JELLYFIN_CONFIG_DIR_=/home/portainer/jellyfin/config
+JELLYFIN_CACHE_DIR_=/home/portainer/jellyfin/cache
+JELLYFIN_DATA_DIR_=
 SAMBA_USERNAME=
 SAMBA_PASSWORD=