Update README/compose with environment variables

Document the available environment variables in the README for better
visibility. Also provide examples in the compose file.

Other minor fixes:
- Removed deprecated version string from compose file
- Changed compose file ports to match readme and config.toml

Author: garlic-hub

README.md

@@ -104,6 +104,18 @@ hostname = "https://my.test.host:4443"
 
 Server will be accessible from `http://localhost:8080`, but episode links will point to `https://my.test.host:4443/ID1/...`
 
+### 🌍 Environment Variables
+
+Podsync supports the following environment variables for configuration and API keys:
+
+| Variable Name                | Description                                                                               | Example Value(s)                              |
+|------------------------------|-------------------------------------------------------------------------------------------|-----------------------------------------------|
+| `PODSYNC_CONFIG_PATH`        | Path to the configuration file (overrides `--config` CLI flag)                            | `/app/config.toml`                            |
+| `PODSYNC_YOUTUBE_API_KEY`    | YouTube API key(s), space-separated for rotation                                          | `AIzaSyD4w2s-k79YNR98ABC` or `key1 key2 key3` |
+| `PODSYNC_VIMEO_API_KEY`      | Vimeo API key(s), space-separated for rotation                                            | `ecd4d34b07bcb9509ABCD` or `key1 key2`        |
+| `PODSYNC_SOUNDCLOUD_API_KEY` | SoundCloud API key(s), space-separated for rotation                                       | `soundcloud_key1 soundcloud_key2`             |
+| `PODSYNC_TWITCH_API_KEY`     | Twitch API credentials in the format `CLIENT_ID:CLIENT_SECRET`, space-separated for multi | `id1:secret1 id2:secret2`                     |
+
 ## 🚀 How to run
 
 

docker-compose.yml

@@ -1,13 +1,16 @@
-version: '2.2'
-
 services:
   podsync:
     container_name: podsync
     image: mxpv/podsync:latest
     restart: always
     ports:
-      - 80:80
+      - 8080:8080
     volumes:
       - ./data:/app/data/
       - ./db:/app/db/
       - ./config.toml:/app/config.toml
+    # environment:
+    #   - PODSYNC_YOUTUBE_API_KEY=${YOUTUBE_API_KEY}
+    #   - PODSYNC_VIMEO_API_KEY=${VIMEO_API_KEY}
+    #   - PODSYNC_SOUNDCLOUD_API_KEY=${SOUNDCLOUD_API_KEY}
+    #   - PODSYNC_TWITCH_API_KEY=${TWITCH_API_KEY}