Add Dockerfile for Easypanel deployment

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+FROM node:20-alpine
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --only=production
+COPY --from=builder /app/dist ./dist
+RUN apk add --no-cache sqlite-libs
+EXPOSE 80
+ENV NODE_ENV=production HOST=0.0.0.0 PORT=80
+CMD ["npx", "astro", "preview", "--host", "0.0.0.0", "--port", "80"]