Runtime build support

[Munkkeli]

Add support for runtime build with the __VITE_RUNTIME_BUILD ENV flag. See the README.md for details.

[Copilot]

Pull request overview

This PR adds runtime build support for React + Vite components by introducing the __VITE_RUNTIME_BUILD environment flag. This enables rebuilding the application at container startup to incorporate deployment-specific environment variables.

Changes:

• Updated dependency versions across multiple packages (React, ESLint, TypeScript, Vite, etc.)
• Replaced nginx with serve for static file serving in production
• Added storage configuration and runtime build logic with init containers in Helm templates

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Updated React, ESLint, TypeScript, and Vite dependencies to newer versions
diploi.yaml	Removed urlFormat field and added build storage configuration for staging/production
README.md	Updated documentation to explain runtime build feature and switched from nginx to serve
Dockerfile.dev	Added corepack and PNPM setup for development environment
Dockerfile	Implemented conditional runtime build support with multi-stage builds using serve instead of nginx
.diploi/helm/app.yaml	Added init container for runtime builds and build storage volume mounts with debug environment variables

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