Add dockerfile and build.

.dockerignore

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+.git/
+.github/
+
+node_modules/
+dist/
+
+.dockerignore
+.gitignore
+
+Dockerfile
+
+LICENSE
+
+*.node_modules
+
+renovate.json

.github/workflows/build-docker.yml

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+name: Docker Multi-Architecture Build
+
+on:
+    push:
+        paths-ignore:
+            - "**.md"
+        branches:
+            - main
+
+jobs:
+    build-docker-image:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - name: Set up QEMU
+              uses: docker/setup-qemu-action@v3
+              with:
+                  platforms: all
+            - name: Set up Docker BuildX
+              uses: docker/setup-buildx-action@v3
+            - name: Login to DockerHub
+              uses: docker/login-action@v3
+              with:
+                  username: ${{ secrets.DOCKER_USERNAME }}
+                  password: ${{ secrets.DOCKER_PASSWORD }}
+            - name: Build and push
+              uses: docker/build-push-action@v6
+              with:
+                  context: .
+                  file: ./Dockerfile
+                  platforms: linux/amd64,linux/arm64
+                  push: true
+                  tags: 1337kavin/bg-helper-server:latest
+                  cache-from: type=gha
+                  cache-to: type=gha,mode=max

Dockerfile

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+FROM oven/bun:latest AS builder
+
+WORKDIR /app/
+
+COPY package.json bun.lockb ./
+
+RUN bun install
+
+COPY . .
+
+RUN bun run build
+
+EXPOSE 3000
+
+CMD ["bun", "dist/index.js"]