feat: add environment variable support and update README instructions

README.md

@@ -34,7 +34,13 @@ peertube-collector/
     cd peertube-collector
     ```
 
-2. Build and start the Docker containers:
+2. Create and configure the environment file based on the `.env.example` file:
+    ```sh
+    cp .env.example .env
+    ```
+
+
+3. Build and start the Docker containers:
     ```sh
     docker-compose up --build
     ```