Serving at a subpath is difficult due to a hardcoded base url

[spantaleev]

Due to

matrix-dimension/web/index.html

Line 86 in b98b284

<base href="/">

.. serving at a different subpath (e.g. DOMAIN/dimension/) means that the index page loads, but all resources are attempted to be loaded from the wrong place (DOMAIN/asset instead of DOMAIN/dimension/asset). To fix it up, one would need to override the base url.

For nginx, one could possibly use a sub_filter, but other reverse-proxies (e.g. Traefik) do not currently have an integrated middleware for arbitrary text replacements.

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I suppose the easiest solution would be to make the docker entrypoint read some environment variable (e.g. BASE_URL) and then do a sed-replace in web/index.html before starting.