GitHub Actions构建Docker镜像因用户名大写报错如何修改yml配置

解决方案 #

核心修改逻辑是将镜像路径中的用户名统一转为全小写，符合ghcr.io的命名规则，以下是可直接使用的修正后配置：

name: Docker CI/CD

on:
  push:
    branches: [ main ]

env:
  # 直接用GitHub内置lower函数将用户名转为全小写，不需要额外步骤处理
  DOCKER_IMAGE: ghcr.io/${{ lower(github.actor) }}/ossp_flaskapp   
  VERSION: ${{ github.sha }}
  NAME: ossprac_container   

jobs:
  build:
    name: Build
    runs-on: ubuntu-latest
    steps:
      - name: Check out source code
        uses: actions/checkout@v2
      - name: Set up docker buildx
        id: buildx
        uses: docker/setup-buildx-action@v1
      - name: Cache docker layers
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ env.VERSION }}
          restore-keys: |
            ${{ runner.os }}-buildx-
      - name: Login to ghcr
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GHCR_TOKEN }}
      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          builder: ${{ steps.buildx.outputs.name }}
          push: true
          tags: ${{ env.DOCKER_IMAGE }}:latest
  deploy:
    needs: build
    name: Deploy
    runs-on: [ self-hosted, label-go ]
    steps:
      - name: Login to ghcr
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GHCR_TOKEN }}
      - name: Docker run
        run: |
          docker stop ${{ env.NAME }} && docker rm ${{ env.NAME }} && docker rmi ${{ env.DOCKER_IMAGE }}:latest
          docker run -d -p 80:80 --name ossprac_container --restart always ${{ env.DOCKER_IMAGE }}:latest

关键修改说明 #

• 原配置全局env中的DOCKER_IMAGE变量直接引用了带大写的${{ github.actor }}，修改为${{ lower(github.actor) }}调用GitHub Actions内置的小写转换函数，自动将用户名转为全小写，满足ghcr的命名要求
• 移除了原有缩进错误的小写转换步骤，使用内置函数方案更简洁，不会出现缩进语法错误
• 登录ghcr时的username字段不需要修改，GitHub本身支持大写用户名验证，仅镜像路径需要全小写

内容的提问来源于stack exchange，提问作者SEOI HONG