Added new docker-compose example file for multiple library folders

Updated docker-compose example file environment variable names due to incompatibility

docker/docker-compose.example-with-multiple-source-folders.yml

@@ -0,0 +1,17 @@
+version: "3"
+services:
+  gameyfin:
+    image: grimsi/gameyfin:latest
+    container_name: gameyfin
+    environment:
+      - GAMEYFIN_USER=<your username here>
+      - GAMEYFIN_PASSWORD=<your password here>
+      - GAMEYFIN_IGDB_API_CLIENT_ID=<your twitch client-id here>
+      - GAMEYFIN_IGDB_API_CLIENT_SECRET=<your twitch client-secret here>
+      - GAMEYFIN_SOURCES=/opt/gameyfin-library/library-1,/opt/gameyfin-library/library-2,/opt/gameyfin-library/library-3
+    volumes:
+      - <Path on your host to the 1st source folder>:/opt/gameyfin-library/library-1
+      - <Path on your host to the 2nd source folder>:/opt/gameyfin-library/library-2
+      - <Path on your host to the 3rd source folder>:/opt/gameyfin-library/library-3
+    ports:
+      - "8080:8080"

docker/docker-compose.example.yml

@@ -4,10 +4,10 @@ services:
     image: grimsi/gameyfin:latest
     container_name: gameyfin
     environment:
-      - gameyfin.user=<your username here>
+      - GAMEYFIN_USER=<your username here>
-      - gameyfin.password=<your password here>
+      - GAMEYFIN_PASSWORD=<your password here>
-      - gameyfin.igdb.api.client-id=<your twitch client-id here>
+      - GAMEYFIN_IGDB_API_CLIENT_ID=<your twitch client-id here>
-      - gameyfin.igdb.api.client-secret=<your twitch client-secret here>
+      - GAMEYFIN_IGDB_API_CLIENT_SECRET=<your twitch client-secret here>
     volumes:
       - <path to your game library>:/opt/gameyfin-library
     ports: