Update Dockerfile for CodeBrain

Dockerfile

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+FROM alpine:3.19
+
+RUN apk add --no-cache ca-certificates git curl iptables ip6tables
+
+# Install Tailscale
+RUN curl -fsSL https://pkgs.tailscale.com/stable/tailscale_1.58.2_amd64.tgz \
+    | tar xz -C /usr/local/bin --strip-components=1 tailscale_1.58.2_amd64/tailscale tailscale_1.58.2_amd64/tailscaled
+
+# Create state directories
+RUN mkdir -p /var/run/tailscale /var/lib/tailscale /home/megamind/data
+RUN adduser -D -u 1000 megamind
+RUN chown -R megamind:megamind /home/megamind /var/run/tailscale /var/lib/tailscale
+
+WORKDIR /home/megamind
+COPY megamind-linux-amd64 /usr/local/bin/megamind
+COPY config.json /home/megamind/config.json
+COPY startup.sh /home/megamind/startup.sh
+RUN chmod +x /home/megamind/startup.sh /usr/local/bin/megamind
+
+EXPOSE 7860
+CMD ["/home/megamind/startup.sh"]