使用act本地运行Docker容器型GitHub Action时拉取镜像报错求助

在本地使用act工具运行自定义Docker GitHub Action时，出现以下错误：

Error response from daemon: pull access denied for act-github-actions-dockeraction, repository does not exist or may require 'docker login': denied: requested access to the resource is denied

即使执行docker login并提示登录成功，错误仍然反复出现。查看act日志发现，工具会先从本地Dockerfile构建镜像：

docker build -t act-github-actions-dockeraction:latest repo/.github/actions

但随后会尝试从Docker Hub拉取该镜像：

docker pull image=act-github-actions-dockeraction:latest platform= username=*** forcePull=true

由于镜像仅存在于本地，导致拉取失败。

使用的文件内容 #

1. Dockerfile #

FROM alpine
RUN apk add --no-cache jq
COPY entrypoint.sh /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]

2. .github/actions/action.yml #

name: test 
description: test
runs:
  using: docker
  image: Dockerfile
inputs:
  jq_selector:
    description: "The jq selector to execute"
    required: false
    default: '.'

3. .github/workflows/show_event.yml #

name: shows event with jq selector
on:
  push:
    branches: [main]
jobs:
  output-debug:
    runs-on: ubuntu-20.04
    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: where am i
        run: pwd

      - name: my custom action
        uses: ./.github/actions 
        with:
          jq_selector: "."

目录结构 #

├── .github
│   ├── actions
│   │   ├── Dockerfile
│   │   ├── action.yaml
│   │   └── entrypoint.sh
│   └── workflows
│       └── show_event.yml

解决方法 #

运行act时添加--no-pull参数，强制工具使用本地已构建的镜像，不再尝试从远程仓库拉取：

act --no-pull

或者使用更明确的参数形式：

act --pull=false

这个参数会告诉act跳过镜像拉取步骤，直接使用本地构建好的act-github-actions-dockeraction:latest镜像运行Action。

内容的提问来源于stack exchange，提问作者SkogensKonung