chore(dashboard): add dockerfile for separate deployment

[Tpuljak]

Description

Add dockerfile to dashboard for separate deployment.

Documentation

• This change requires a documentation update
• I have made corresponding changes to the documentation

[Copilot]

Pull Request Overview

This PR introduces separate deployment capability for the dashboard by creating a standalone Docker container. The API service can now optionally disable serving dashboard static files via a new environment variable, allowing the dashboard to be deployed independently using nginx.

Key changes:

• Added Dockerfile and nginx configuration for standalone dashboard deployment
• Introduced DONT_SERVE_DASHBOARD environment variable to control whether API serves dashboard files
• Updated API module to conditionally serve static dashboard files based on configuration

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
apps/dashboard/Dockerfile	New multi-stage Dockerfile for building and serving dashboard with nginx
apps/dashboard/docker/nginx/default.conf	nginx configuration for serving dashboard with routing to /dashboard path
apps/dashboard/docker/entrypoint.sh	Entrypoint script to inject API URL and start nginx
apps/dashboard/project.json	Added docker build and version check tasks
apps/api/src/app.module.ts	Modified ServeStaticModule to conditionally serve dashboard based on configuration
apps/api/src/config/configuration.ts	Added dontServeDashboard configuration property
apps/api/Dockerfile	Set default value for DONT_SERVE_DASHBOARD environment variable
apps/api/.env	Added DONT_SERVE_DASHBOARD environment variable for local development
apps/api/src/main.ts	Removed await from otelSdk.start() call
apps/docs/src/content/docs/en/oss-deployment.mdx	Documented new DONT_SERVE_DASHBOARD environment variable

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