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

docker/sparkl2/Dockerfile

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+ARG LNBITS_TAG=latest
+
+FROM lnbits/lnbits:${LNBITS_TAG}
+
+RUN apt-get update && apt-get -y upgrade
+RUN apt-get install -y netcat-openbsd npm nodejs git
+
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh
+ENV PATH="/root/.local/bin:$PATH"
+
+# install sparksidecar
+RUN git clone https://github.com/lnbits/spark_sidecar
+RUN cd spark_sidecar && npm install
+
+# Reinstall dependencies for lnbits just in case (needed for CMD usage)
+RUN uv sync --all-extras
+
+# LNBITS
+ENV LNBITS_PORT="5000"
+ENV LNBITS_HOST="0.0.0.0"
+ENV LNBITS_BACKEND_WALLET_CLASS="SparkL2Wallet"
+ENV FUNDING_SOURCE_MAX_RETRIES=10
+
+# spark sidecar
+ENV SPARK_MNEMONIC="bottom bottom bottom bottom bottom bottom bottom bottom bottom bottom bottom bottom"
+ENV SPARK_NETWORK="MAINNET"
+ENV SPARK_SIDECAR_PORT="8765"
+ENV SPARK_PAY_WAIT_MS="20000"
+
+EXPOSE 5000
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# Entrypoint to start sparksidebar and LNbits
+CMD ["/entrypoint.sh"]

docker/sparkl2/entrypoint.sh

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+#!/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='*'