Fix deployment url in dashboard dockerfile (#34026)

GitOrigin-RevId: 9a952f66c2c7a1f3a4a1a363b37bf2d41352423a

Author: emmaling27

self-hosted/Dockerfile.dashboard

@@ -6,9 +6,6 @@ COPY ./npm-packages ./npm-packages
 # Install dependencies and build
 WORKDIR /app/npm-packages/dashboard-self-hosted
 RUN rush install
-# NEXT_PUBLIC_DEPLOYMENT_URL is baked into the nextjs build
-# TODO: Make this configurable at runtime
-ENV NEXT_PUBLIC_DEPLOYMENT_URL="http://127.0.0.1:3210"
 ENV NODE_ENV=production
 RUN rush build -t dashboard-self-hosted
 RUN rush-pnpm deploy --filter=dashboard-self-hosted --prod /tmp/deploy
@@ -23,4 +20,4 @@ USER nextjs
 EXPOSE 6791
 ENV PORT=6791
 ENV HOSTNAME=0.0.0.0
-CMD ["node", "./server.js"]
+CMD ["node", "./server.js"]