feat: restructure docker images, add sparkl2 docker image (#3794)

docker/boltzclient/entrypoint.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+set -e
+
+boltzd --standalone --referralId lnbits &
+
+# Capture boltzd PID to monitor if needed
+BOLTZ_PID=$!
+
+# Wait for boltzd to start
+for i in {1..10}; do
+  if nc -z localhost 9002; then
+    echo "boltzd is up!"
+    break
+  fi
+  echo "Waiting for boltzd to start..."
+  sleep 1
+done
+
+# Optional: check if still not up
+if ! nc -z localhost 9002; then
+  echo "boltzd did not start successfully."
+  exit 1
+fi
+
+echo "Starting LNbits on $LNBITS_HOST:$LNBITS_PORT..."
+exec uv run lnbits --port "$LNBITS_PORT" --host "$LNBITS_HOST" --forwarded-allow-ips='*'