Add Docker support for multi-platform CasaOS deployment

docker/.gitignore

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+# CasaOS Docker Environment
+
+# Data directories
+data/
+logs/
+config/
+
+# Docker volumes
+.volumes/
+
+# Temporary files
+*.tmp
+*.log
+
+# macOS
+.DS_Store
+
+# IDE files
+.vscode/
+.idea/
+
+# Environment files
+.env
+.env.local
+
+# Backup files
+*.bak
+*.backup

docker/Dockerfile

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+# CasaOS Dockerfile
+# Ubuntu 22.04 based CasaOS container
+
+FROM ubuntu:22.04
+
+# Metadata
+LABEL maintainer="CasaOS User"
+LABEL description="CasaOS Personal Cloud in Docker"
+LABEL version="1.0"
+
+# Set timezone
+ENV TZ=Europe/Istanbul
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install system packages
+RUN apt-get update && apt-get install -y \
+    curl \
+    wget \
+    sudo \
+    systemd \
+    systemd-sysv \
+    init \
+    ca-certificates \
+    gnupg \
+    lsb-release \
+    docker.io \
+    docker-compose \
+    openssl \
+    git \
+    net-tools \
+    htop \
+    nano \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy CasaOS installation script
+COPY install-casaos.sh /usr/local/bin/install-casaos.sh
+RUN chmod +x /usr/local/bin/install-casaos.sh
+
+# Create necessary directories
+RUN mkdir -p /var/lib/casaos \
+             /etc/casaos \
+             /usr/share/casaos \
+             /DATA \
+             /var/log/casaos
+
+# Install CasaOS
+RUN /usr/local/bin/install-casaos.sh || true
+
+# Configure systemd services
+RUN systemctl enable systemd-networkd
+RUN systemctl enable systemd-resolved
+
+# Expose ports
+EXPOSE 80 443
+
+# Volume mount points
+VOLUME ["/var/lib/casaos", "/etc/casaos", "/usr/share/casaos", "/DATA"]
+
+# Start systemd
+CMD ["/sbin/init"]
+
+# Healthcheck
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
+    CMD curl -f http://localhost/ || exit 1