Update README.md

Author: Firaenix

README.md

@@ -103,8 +103,8 @@ You can then follow the step by step instructions below dependent on your operat
 
 #### Docker
 ##### Option 1. To run the container in interactive mode: 
-   ```
-   bash docker run -it --mount type=volume,source="bitpingd-volume",target=/root/.bitpingd bitping/bitpingd:latest
+   ```bash
+    docker run -it --mount type=volume,source="bitpingd-volume",target=/root/.bitpingd bitping/bitpingd:latest
    ```
 
 ##### Option 2. To run the container and pass email and password via CLI instead of an interactive session run:  
@@ -116,7 +116,16 @@ You can then follow the step by step instructions below dependent on your operat
        ```bash 
        docker run -it --mount type=volume,source="bitpingd-volume",target=/root/.bitpingd bitping/bitpingd:latest
        ```
-       
+
+##### Option 3. Login with environment variables:  
+   ```bash 
+   docker run -it \
+     -e BITPING_EMAIL='YOUR_BITPING_EMAIL' \
+     -e BITPING_PASSWORD='YOUR_BITPING_PASSWORD' \
+     -e BITPING_MFA='YOUR_BITPING_2FA_CODE' \
+     --mount type=volume,source="bitpingd-volume",target=/root/.bitpingd bitping/bitpingd:latest
+   ```
+
 ## Support
 
 If you encounter any issues or need further guidance, please: