Governments can make evading their censorship very difficult, painful, and risky, if they want to. It can have a huge impact.
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If you added a feature to push/fetch and sync the local development database from an s3 (or like bucket) it would solve one of the real core problems of new developers getting started.
That nginx proxy probably works 99.999% of the time, but oh boy, is that .001% going to tick someone off. Proxy's always add a small layer of complexity that can fubar things in strange ways, i know from running many of proxies in production just fine until that tiny little app/proxy config change that borks it. I haven't dug in enough yet, but i hope it can be bypassed.
Ambitious project that I think has some legs. A lot of devs dislike docker and many teams struggle to use it well anyway (for instance, a good dev Dockerfile is usually not the same as a good production Dockerfile). You will need to make this more "IAC-like" if you want to beat it though, imho.
Keep going and good luck!