add docker file

dockerfile

@@ -0,0 +1,23 @@
+FROM node:22-alpine
+
+WORKDIR /app
+
+# Enable pnpm
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
+# Install deps
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+
+# Copy source
+COPY . .
+
+# Prisma generate
+RUN pnpm prisma generate
+
+# Build NestJS
+RUN pnpm build
+
+EXPOSE 3000
+
+CMD ["node", "dist/main"]