StartOS (Start9) wrapper

[remcoros]

I've created a wrapper for both the public-pool backend and UI here: https://github.com/remcoros/public-pool-startos

One caveat is the lack of port forwarding non-http ports in the current StartOS version (0.3.5), so it requires a DIY step (explained in the instructions).

To mine on testnet4, I've also created a fork of the bitcoin core service running testnet4 for StartOS here: https://github.com/remcoros/bitcoind-startos

Starting from Bitcoin Core 28.0, the npm package 'rpc-bitcoin' will break (vansergen/rpc-bitcoin#65), I fixed that by using 'patch-package' here: https://github.com/remcoros/public-pool-startos/blob/main/Dockerfile#L37

I understood that some work to wrap public-pool for StartOS was already done, but could not find any additional info or repository, so I went ahead and created this myself.

Hope this useful and happy to provide more details.