fix(docker): Configure nginx for consistent port mapping and hot reloading

[vedantprajapati]

fix(docker): Configure nginx for consistent port mapping and hot reloading

SUMMARY

Addresses issue #32178. This PR modifies the nginx.conf file within the Docker Compose setup to ensure consistent port mapping for the Superset frontend. This resolves the broken hot reloading functionality reported as well. The frontend runs on port 9000, and nginx is configured to proxy requests to this port. This change ensures that changes to the frontend assets are correctly served by the development server.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

docker compose down/up --build and validate that localhost:9000 reflects changes

ADDITIONAL INFORMATION

• Has associated issue:
  Fixes Superset Frontend hot reloading not working when running docker compose up --build #32178.
  Fixes Superset 5.0.0rc1 - logging in after docker compose up shows broken front-end #32187
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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[github-actions]

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[JZ6]

This fix is a godsend

[mistercrunch]

Not sure why this is required only in some environments (could not reproduce the issue in my envrionment). In any case, happy to merge if that fixes things for people.