docker file setup

README.md

@@ -35,9 +35,11 @@ pnpm run payload:migrate:create
 Deploying the portfolio is done as a docker container. It can be built with the following command:
 
 ```bash
-docker build -t liam-portfolio .
+docker build --add-host=host.docker.internal:host-gateway --build-arg HOST_GATEWAY=host.docker.internal -t liam-portfolio .
 ```
 
+NOTE: Ensure a .env exists with the correct environment variables, including the DATABASE_URL and PAYLOAD_SECRET.
+
 ### Running the Container
 
 Once the container is built, you can run it with the following command: