combine workflows, using choice input for selecting the target platform

.github/workflows/build.yml

@@ -0,0 +1,55 @@
+name: Export docker images
+on:
+  workflow_dispatch:
+    inputs:
+      docker_images:
+        description: 请填写docker镜像名称 多个用英文逗号分开
+        required: true
+        default: 'alpine:latest,ubuntu:latest'  # 设置默认的 Docker 镜像列表
+      arch:
+        description: 系统架构
+        required: true
+        default: amd64
+        type: choice
+        options:
+          - amd64
+          - arm64
+          - arm32
+
+jobs:
+  pull_and_package:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Clean up Docker to free space
+      run: |
+          docker system prune -a -f
+          docker volume prune -f
+
+    - name: Pull Docker Images and Package
+      run: |
+        platform=${{ github.event.inputs.arch }}
+        if [[ $platform == 'arm32' ]]; then platform="arm/v7"; fi
+        images="${{ github.event.inputs.docker_images }}"
+        IFS=',' read -r -a image_array <<< "$images"
+        for image in "${image_array[@]}"; do
+          # trim the prefix or suffix whitespaces, can also use `image=$(echo $image | xargs)`
+          # see also https://stackoverflow.com/questions/369758/how-to-trim-whitespace-from-a-bash-variable
+          image=$(echo $image)
+          docker pull "${image}" --platform "linux/${{ github.event.inputs.arch }}"
+          docker save "${image}" -o "${image//\//_}-${{ github.event.inputs.arch }}.tar"
+        done
+
+    - name: Compress the TAR files
+      run: |
+        tar -cJf ${{ github.event.inputs.arch }}-images.tar.xz *-${{ github.event.inputs.arch }}.tar
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{ github.event.inputs.arch }}-docker-images
+        path: ${{ github.event.inputs.arch }}-images.tar.xz
+        retention-days: 1  # 将保留天数设置为 1 天 最多可设置90天