update dockerfile example

Author: PatatoBit

Dockerfile.example

@@ -23,7 +23,9 @@ FROM node:lts-alpine as prod-runner
 # Set work directory
 WORKDIR /app
 
-ENV BOT_TOKEN=YOUR_BOT_TOKEN
+ENV BOT_TOKEN=
+ENV WELCOME_CHANNEL=
+ENV ADMIN_CHANNEL=
 
 # Copy package.json from build-runner
 COPY --from=build-runner /tmp/app/package.json /app/package.json
@@ -35,4 +37,4 @@ RUN npm install --only=production
 COPY --from=build-runner /tmp/app/build /app/build
 
 # Start bot
-CMD [ "npm", "start" ]
+CMD [ "npm", "start" ]