Add Dockerfile

Dockerfile

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+# Extends the official OpenClaw image with what Homebrew needs.
+# Brew itself is installed into the mounted volume on first start (see brew-entrypoint.sh),
+# so brew and everything it installs survive image updates.
+
+ARG OPENCLAW_VERSION=latest
+# Check docs.openclaw.ai/install/docker for the exact official image name.
+FROM ghcr.io/openclaw/openclaw:${OPENCLAW_VERSION}
+
+USER root
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        build-essential procps curl file git ca-certificates \
+    && rm -rf /var/lib/apt/lists/* \
+    && mkdir -p /home/linuxbrew/.linuxbrew \
+    && chown -R node:node /home/linuxbrew
+
+COPY --chmod=755 brew-entrypoint.sh /usr/local/bin/brew-entrypoint.sh
+
+USER node
+ENV HOMEBREW_PREFIX=/home/linuxbrew/.linuxbrew \
+    HOMEBREW_NO_AUTO_UPDATE=1 \
+    HOMEBREW_NO_ANALYTICS=1 \
+    PATH=/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin:${PATH}
+
+# Setting ENTRYPOINT resets the base image's CMD, so you must restore it.
+# Find the originals with:
+#   docker inspect --format '{{json .Config.Entrypoint}} {{json .Config.Cmd}}' <official-image>
+# If the base image has its own ENTRYPOINT, add it after brew-entrypoint.sh in the list below.
+ENTRYPOINT ["/usr/local/bin/brew-entrypoint.sh"]
+CMD ["sh", "brew_entrypoint.sh"]
+ENTRYPOINT ["tini", "-s", "--", "node", "/app/docker-entrypoint.mjs"]
+CMD ["node", "openclaw.mjs", "gateway"]