Add Dockerfile for Bun canary on Alpine

Dockerfile

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+# Use Bun canary on Alpine
+FROM oven/bun:canary-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files first for caching
+COPY package.json bun.lockb ./
+
+# Install all dependencies (including devDeps)
+RUN bun install
+
+# Copy the rest of the project
+COPY . .
+
+# Build the project
+RUN bun run build
+
+# Remove devDependencies to shrink image
+RUN bun prune --prod
+
+# Expose Vite preview port
+EXPOSE 4173
+
+# Run the built project
+CMD ["bun", "run", "preview"]