优化 docker 构建的镜像文件大小，添加自动化构建 (#42)

* perf: optimize docker image

* perf: shrink image size

* fix: build docker image

* fix: docker image namespace

* docs: add docker compose example

* docs: fix docker compose example

* docs: fix again :)

* docs: and again.....

.github/workflows/build_docker.yml

@@ -0,0 +1,37 @@
+name: build_docker
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build_docker:
+    name: Build docker
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: 0xjerry/chatgpt-web
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64