考虑如下项目结构：

/
├── .github/
│   └── workflows/
│           example.yml
├── myfolder/
│       ChineseSimplified.isl
│       InnoSetup.iss
└── 其他文件

# .github/workflows/example.yml

name: Build and Package

on:
  push:

jobs:
  build:
    runs-on: windows-2022

    steps:
      - name: Checkout
        uses: actions/checkout@v5
      
      # 安装特定版本的 Inno Setup 并添加到环境变量
      - name: Install Inno Setup
        run: |
          # 发现异常时报错
          $ErrorActionPreference = 'Stop'
          $PSNativeCommandUseErrorActionPreference = $true

          curl.exe -OL https://files.jrsoftware.org/is/6/innosetup-6.5.0.exe
          .\innosetup-6.5.0.exe /VERYSILENT /SUPPRESSMSGBOXES /NORESTART
          "C:\Program Files (x86)\Inno Setup 6" >> $env:GITHUB_PATH
        shell: pwsh
        
      # 中间的步骤是编译你自己项目产物，这里省略
        
      # 执行 Inno Setup 打包
      - name: Build Installer
        run: ISCC.exe myfolder\InnoSetup.iss
        shell: pwsh