Set up Bitcoin node and Lightning infrastructure with Docker

Create Docker Compose configuration, Bitcoin and LND configuration files, and bootstrap/init scripts for setting up a Bitcoin full node, LND, and LNbits on a Digital Ocean droplet.

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infrastructure/configs/bitcoin.conf

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+# Bitcoin Core — mainnet
+# Placed at /data/bitcoin/bitcoin.conf on the droplet
+
+# Network
+server=1
+listen=1
+bind=0.0.0.0
+
+# RPC (internal Docker network only — never exposed publicly)
+rpcbind=0.0.0.0
+rpcallowip=172.0.0.0/8
+rpcuser=satoshi
+# rpcpassword is set by setup.sh — do not hardcode here
+
+# ZMQ — LND uses these to get notified of new blocks/txs
+zmqpubrawblock=tcp://0.0.0.0:28332
+zmqpubrawrx=tcp://0.0.0.0:28333
+
+# Performance
+dbcache=512
+maxmempool=300
+maxconnections=40
+
+# Prune options — choose one:
+#   Full node (recommended, ~600GB): comment out both prune lines
+#   Pruned (~10GB, lower cost but loses historical tx data):
+# prune=10240
+
+# Logging
+debug=0