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

docker/sparkl2/entrypoint.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -e
+
+node spark_sidecar/server.mjs &
+
+SIDECAR_PID=$!
+
+# Wait for startup
+for i in {1..10}; do
+  if nc -z localhost $SPARK_SIDECAR_PORT; then
+    echo "sparksidebar is up!"
+    break
+  fi
+  echo "Waiting for sparksidebar to start..."
+  sleep 1
+done
+
+# Optional: check if still not up
+if ! nc -z localhost $SPARK_SIDECAR_PORT; then
+  echo "sparksidebar 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='*'