Allow accessing the web UI from webpack

[imobachgs]

Trello: https://trello.com/c/8fSBUP9P/3594-3-improve-agama-web-server-integration-with-the-web-ui

Accessing Agama server through webpack

When developing the web UI, you need to access Agama web server. Similarly to what we implemented for Cockpit, you can access it directly by setting the AGAMA_SERVER environment variable. By default, it is set to localhost:3000.

AGAMA_SERVER=localhost:4567 npm run server

The API is available under the /api path.

const ping = await fetch("/api/ping");

Service the web UI in agama-web-server

The new Agama web server will expose the web UI in the root (/) path. By default, it uses $HOME/.local/agama/web-ui, falling back to /usr/share/agama/web-ui. However, you can override that route using the new --public-dir argument.

agama-web-server serve --public-dir /srv/agama/web-ui

NOTE: Additionally, we could implement support for reading the public directory from an environment variable (e.g., AGAMA_PUBLIC_DIR). In that case, you could use dotenv (or your favorite alternative) to set it automatically to ../web/dist.

Tasks

• Access Agama server from webpack
• Serve the web UI through agama-web-server
• Move the API to /api
• Update the documentation

[coveralls]

coverage: 74.923% (-10.3%) from 85.218%
when pulling 08c8700 on web-dx
into 7de4495 on architecture_2024.

[dgdavid]

LGTM, just a typo