GitHub Actions子文件夹Composite Action配置报错：缺失shell属性

我在配置Composite Action时，将action.yml放在了仓库的.github/actions/release子文件夹中，然后从另一个仓库调用该Action，使用的Workflow代码如下：

name: "Terraform"
on:
  pull_request:
    types: [closed]
    branches:
      - 'main'
env:
  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    
jobs:
  terraform:
    name: 'Terraform'
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v3
        
      - name: checkout composite action
        uses: actions/checkout@v3
        with:
          repository: ppratheesh/terraform-exercise
          path: ./github-shared-workflows
          
         
      - name: release action
        uses: ./github-shared-workflows/.github/actions/release
        with:
          RELEASE_BRANCH: main
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

执行时出现以下报错：

Error: /home/runner/work/terraform-ec2/terraform-ec2/./github-shared-workflows/.github/actions/release/action.yml (Line: 24, Col: 9): Required property is missing: shell
Error: /home/runner/work/terraform-ec2/terraform-ec2/./github-shared-workflows/.github/actions/release/action.yml (Line: 28, Col: 9): Required property is missing: shell
Error: /home/runner/work/terraform-ec2/terraform-ec2/./github-shared-workflows/.github/actions/release/action.yml (Line: 24, Col: 9): Required property is missing: shell

解决方法 #

报错的核心原因是Composite Action的action.yml文件中，所有带有run字段的步骤必须显式指定shell属性——这和普通Workflow不同，普通Workflow会自动使用默认shell，但Composite Action没有这个默认值。

你需要修改目标仓库里的.github/actions/release/action.yml文件：

1. 定位报错提示的第24、28行对应的run步骤
2. 给每个包含run命令的步骤添加shell配置（可根据需求选择bash、pwsh等类型）

示例修改：
原步骤（错误写法）：

steps:
  - name: 执行发布脚本
    run: |
      echo "开始构建发布包"
      # 其他发布逻辑

修改后（正确写法）：

steps:
  - name: 执行发布脚本
    run: |
      echo "开始构建发布包"
      # 其他发布逻辑
    shell: bash

确保所有带run字段的步骤都添加了shell属性，保存后重新运行Workflow即可解决报错。

内容的提问来源于stack exchange，提问作者Pratheesh