chore: refactor dockerfile for improved build and runtime

- Updated dockerfile to use multi-stage builds for better caching and smaller image size.
- Added a .dockerignore file to exclude unnecessary files from the docker image.
- Using pnpm for package management.

Author: thdxg

.dockerignore

@@ -0,0 +1,20 @@
+# Dependencies
+node_modules
+
+# Next.js build output
+.next
+
+# Optional local environment variables
+.env.local
+.env.*.local
+
+# Git
+.git
+.gitignore
+
+# Docker
+Dockerfile
+.dockerignore
+
+# Other
+README.md

Dockerfile

@@ -1,28 +1,22 @@
 # syntax=docker/dockerfile:1
 
-FROM node:22-alpine AS builder
-
+FROM node:22-slim AS base
+ENV PNPM_HOME="/pnpm"
+ENV CI="true"
+ENV PATH="$PNPM_HOME:$PATH"
+RUN corepack enable
+COPY . /app
 WORKDIR /app
 
-RUN npm install -g pnpm
-
-COPY package.json pnpm-lock.yaml ./
-
-RUN pnpm install
-
-COPY . .
+FROM base AS deps
+RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --prod --frozen-lockfile
 
+FROM base AS build
+RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
 RUN pnpm run build
 
-
-FROM node:22-alpine AS runner
-
-WORKDIR /app
-
-COPY --from=builder /app/.next/standalone ./
-COPY --from=builder /app/.next/static ./.next/static
-COPY --from=builder /app/public ./public
-
+FROM base AS runner
+COPY --from=deps /app/node_modules /app/node_modules
+COPY --from=build /app/.next /app/.next
 EXPOSE 3000
-
-CMD ["node", "server.js"]
+CMD [ "pnpm", "start" ]