add platform option

.github/workflows/download.yml

@@ -12,18 +12,26 @@ jobs:
       - name: Check out repository code
         uses: actions/checkout@v4
 
-      - name: Get the image name
-        id: get-image-name
+      - name: Get the image info
         run: |
-          TAG_NAME="${GITHUB_REF#refs/tags/}"
-          IMAGE_NAME="${TAG_NAME//--/:}"
-          echo "IMAGE_NAME=$IMAGE_NAME" >> $GITHUB_ENV
+          tag_name="${GITHUB_REF#refs/tags/}"
+          image_name="${tag_name//--/:}"
+          platform="amd64"
+          
+          regex="(.+)(-amd64|-arm64)$"
+          if [[ $image_name =~ $regex ]]; then
+            image_name="${BASH_REMATCH[1]}"
+            platform="${BASH_REMATCH[2]#-}"
+          fi
+          
+          echo "image_name=$image_name" >> $GITHUB_ENV
+          echo "platform=$platform" >> $GITHUB_ENV
 
       - name: Pull Docker image
-        run: docker pull "$IMAGE_NAME"
+        run: docker pull --platform linux/"$platform" "$image_name"
 
       - name: Export Docker image
-        run: docker save -o image.tar "$IMAGE_NAME"
+        run: docker save -o image.tar "$image_name"
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4

README.md

@@ -10,6 +10,7 @@ Fork and clone this repository and create a tag by Docker image name, and then t
 
 Note: 
 - There must not be `:` in git tag, so you should use `--` to represent `:` in the tag name.
+- The workflow will use `linux/amd64` platform by default, if you want `linux/arm64` image, you can add suffix `-arm64` in tag name.
 - Workflows are not being run on forked repository by default, so you should enable it manually. See [docs](https://docs.github.com/en/actions/using-workflows/disabling-and-enabling-a-workflow?tool=webui#enabling-a-workflow).
 
 For example, you want to download the Docker image `testcontainers/ryuk:0.5.1`, then you should execute the following commands:

README_CN.md

@@ -10,6 +10,7 @@ fork 并 clone 本仓库，并根据需要下载的镜像名称创建 git tag，
 
 注意：
 - 因为 git tag 中不能有 `:`，因此你需要使用 `--` 来代替镜像名称中的 `:`。
+- 工作流默认使用 `linux/amd64` 平台，如果你想要 `linux/arm64` 的镜像，可以在标签名中添加后缀 `-arm64`。
 - 默认情况下，GitHub Action 在 fork 仓库里是未启用的，因此你可能需要手动启用它。请参阅[文档](https://docs.github.com/en/actions/using-workflows/disabling-and-enabling-a-workflow?tool=webui#enabling-a-workflow)。
 
 现在假设你要下载 Docker 镜像 `testcontainers/ryuk:0.5.1`，那么你应该在项目目录执行以下命令：