[Feature Request] Support more signet networks

[tee8z]

During elcair's startup a check is made against the bitcoind instance to verify it is using the expected network by looking up a hardcoded transaction that exists for the given network. This seems fine for mainnet and testnets where they are defined by bitcoin conf itself. For signets, however, this causes challenges as its more common for someone to spin up their own signet for testing and thus wont be able to run eclair against it (since the transaction wont exist on their custom signet). For example, having this network check not be configurable for signet stops anyone from running eclair against mutinynet. Goal of this feature would be to allow the node runner the ability to use any signet they choose.

eclair/eclair-core/src/main/scala/fr/acinq/eclair/Setup.scala

Line 164 in 826284c

case "signet" => bitcoinClient.invoke("getrawtransaction", "ff1027486b628b2d160859205a3401fb2ee379b43527153b0b50a92c17ee7955") // coinbase of #5000

[t-bast]

That sounds reasonable, and should be simple enough to do! @remyers can you add this to your backlog?

[remyers]

@tee8z I'm closing the case as fixed by #3088, but please do leave a comment to let us know when you have tried out this feature for your custom signet.