Migrate the web runner stage from the official nginx alpine image to a
standard alpine image with the nginx package installed. This ensures
the presence of the `http_sub_module` required for path rewriting in
the telemetry proxy configuration.
- Replace `nginx:1.27-alpine` with `alpine:3.20` and `apk add nginx`
- Update Nginx configuration file path to `/etc/nginx/http.d/default.conf`
- Update web asset root directory to `/var/lib/nginx/html`
- Add `X-Forwarded-For` and `X-Forwarded-Proto` headers to proxy locations
MythEclipse
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