…ient locally with SSG

Added detailed instructions for building a Next.js client with Static Site Generation (SSG) in a Docker Compose environment. The steps include adjustments to the compose.prod.yaml file, starting the php service container, optional creation of a .env file for the Next.js client, building the pwa service, and finally bringing up the full project. This setup ensures the Next.js client can access the API at build time for static page generation.

…with docker compose

Updated the Next.js documentation to include instructions for generating a production build locally using Docker Compose. The update provides a link to the detailed steps in the Docker Compose deployment guide.

… Kubernetes doc

Added optional Docker build command for SSG projects in Kubernetes doc. This command allows the PWA to access a locally running API during the build process, useful for generating static pages at build time.

…variables

To ensure TRUSTED_HOSTS and MERCURE_PUBLIC_URL remain valid when altering SERVER_NAME to use an HTTP scheme or include a port, these variables must be overridden. This adjustment accommodates configurations where SERVER_NAME deviates from the standard HTTPS format or includes port specifications.