Add docker image building

Dockerfile

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+# ===================================
+# Stage 1: Build Vue.js webapp
+# ===================================
+FROM node:22-alpine AS webapp-builder
+
+WORKDIR /webapp
+
+# Copy webapp package files
+COPY pmoapp/webapp/package*.json ./
+
+# Install dependencies
+RUN npm ci --production=false
+
+# Copy webapp source
+COPY pmoapp/webapp/ ./
+
+# Build the webapp
+RUN npm run build
+
+# ===================================
+# Stage 2: Build Rust binary
+# ===================================
+FROM rustlang/rust:nightly-bookworm AS rust-builder
+
+WORKDIR /build
+
+# Install system dependencies for building
+RUN apt-get update && apt-get install -y \
+    libsoxr-dev \
+    libasound2-dev \
+    pkg-config \
+    cmake \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy Cargo workspace files
+COPY Cargo.toml Cargo.lock ./
+
+# Copy all crates
+COPY PMOMusic/ ./PMOMusic/
+COPY pmoupnp/ ./pmoupnp/
+COPY pmomediarenderer/ ./pmomediarenderer/
+COPY pmomediaserver/ ./pmomediaserver/
+COPY pmoconfig/ ./pmoconfig/
+COPY pmoutils/ ./pmoutils/
+COPY pmodidl/ ./pmodidl/
+COPY pmoserver/ ./pmoserver/
+COPY pmocache/ ./pmocache/
+COPY pmocovers/ ./pmocovers/
+COPY pmoaudiocache/ ./pmoaudiocache/
+COPY pmoaudio/ ./pmoaudio/
+COPY pmoqobuz/ ./pmoqobuz/
+COPY pmoparadise/ ./pmoparadise/
+COPY pmosource/ ./pmosource/
+COPY pmoplaylist/ ./pmoplaylist/
+COPY pmoflac/ ./pmoflac/
+COPY pmometadata/ ./pmometadata/
+COPY pmocontrol/ ./pmocontrol/
+COPY pmoaudio-ext/ ./pmoaudio-ext/
+COPY pmoapp/ ./pmoapp/
+
+# Copy the webapp dist from previous stage
+COPY --from=webapp-builder /webapp/dist ./pmoapp/webapp/dist/
+
+# Build the Rust binary in release mode
+RUN cargo build --release --bin PMOMusic
+
+# Strip debug symbols to reduce binary size
+RUN strip /build/target/release/PMOMusic
+
+# ===================================
+# Stage 3: Minimal runtime image
+# ===================================
+FROM debian:bookworm-slim
+
+# Install only runtime dependencies
+RUN apt-get update && apt-get install -y \
+    libsoxr0 \
+    libasound2 \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create a non-root user
+RUN useradd -m -u 1000 pmomusic
+
+# Copy the binary from builder
+COPY --from=rust-builder /build/target/release/PMOMusic /usr/local/bin/PMOMusic
+
+# Set ownership
+RUN chown pmomusic:pmomusic /usr/local/bin/PMOMusic
+
+# Switch to non-root user
+USER pmomusic
+
+# Create directories for configuration and cache
+RUN mkdir -p /home/pmomusic/.pmomusic
+
+# Set working directory
+WORKDIR /home/pmomusic
+
+# Expose default port (adjust if needed)
+EXPOSE 8080
+
+# Health check (adjust the URL if needed)
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD ["/usr/local/bin/PMOMusic", "--help"] || exit 1
+
+# Run the binary
+ENTRYPOINT ["/usr/local/bin/PMOMusic"]