Initial Docker deployment setup

.env.example

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+# Address and port on the Docker host.
+FRONTEND_BIND=127.0.0.1:18080
+
+# URL of the backend client configuration endpoint.
+VITE_CONFIG_URL=https://hub.example.com/api/client/config/global
+
+# Use an empty value when the frontend and its assets use the same origin.
+ASSETS_BASE=
+
+VITE_USE_MULTIHUB=false
+VITE_MULTIHUB_DISCOVERY=