chore: migrate to pnpm for package management and update CI configuration

- Replaced npm with pnpm in the CI configuration and Dockerfile for improved dependency management.
- Updated package.json to specify pnpm as the package manager.
- Modified installation instructions in README.md to reflect the use of pnpm.
- Enhanced the build process in the Dockerfile to utilize pnpm for installing dependencies and building the application.

Dockerfile

@@ -1,14 +1,30 @@
+FROM docker-mirror.ravanertebat.ir/hub/node:22.14 AS base
 
-
-FROM docker-mirror.ravanertebat.ir/hub/node:22.14
+ENV PNPM_HOME="/pnpm"
+ENV PATH="${PNPM_HOME}:${PATH}"
 
 WORKDIR /app
+RUN corepack enable
 
+FROM base AS deps
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+
+FROM base AS builder
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN pnpm run build
+
+FROM docker-mirror.ravanertebat.ir/hub/node:22.14 AS runner
+
+WORKDIR /app
 ENV NODE_ENV=production
-
-COPY ./artifacts/node/ ./
-
 ENV HOSTNAME="0.0.0.0"
+
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+
 EXPOSE 3000
 
 CMD ["node", "server.js"]