为了获得delete事件上的ref名称，我最终使用了sed。

on:
  delete:
...
steps:
  - name: Do something
    shell: bash
    run: |
      refname=$(sed -e s:refs/heads/::g -e s:/:-:g <<< ${{ github.event.ref }})

剪掉指针/头/并将斜杠转换为破折号，例如。引用/heads/feature/somefeature到feature-somefeature

现在不建议使用setenv。建议使用环境文件。基于@youjin的回答，同时仍然允许功能/分支(用-替换所有/的出现)，我现在使用这个:

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Get branch name (merge)
        if: github.event_name != 'pull_request'
        shell: bash
        run: echo "BRANCH_NAME=$(echo ${GITHUB_REF#refs/heads/} | tr / -)" >> $GITHUB_ENV

      - name: Get branch name (pull request)
        if: github.event_name == 'pull_request'
        shell: bash
        run: echo "BRANCH_NAME=$(echo ${GITHUB_HEAD_REF} | tr / -)" >> $GITHUB_ENV

      - name: Debug
        run: echo ${{ env.BRANCH_NAME }}

我添加了一个单独的步骤，用于从$GITHUB_REF提取分支名称，并将其设置为步骤输出

- name: Extract branch name
  shell: bash
  run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
  id: extract_branch

在那之后，我可以在接下来的步骤中使用它

- name: Push to ECR
  id: ecr
  uses: jwalton/gh-ecr-push@master
  with:
    access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
    secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
    region: us-west-2
    image: eng:${{ steps.extract_branch.outputs.branch }}

更新

GitHub现在支持GITHUB_REF_NAME，它代表触发工作流运行的分支或标记名称。

GitHub文档在这个https://docs.github.com/en/actions/learn-github-actions/environment-variables#default-environment-variables上

要处理pull_request事件(在这种情况下，$GITHUB_REF包含一些无用的东西，如refs/pull/519/merge)，你可以使用这一行:

   - name: Set branch name
     run: echo "::set-output name=branch_name::$(echo ${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}})"

你可以使用https://github.com/rlespinasse/github-slug-action

# Just add this  => 
- name: Inject slug/short variables
  uses: rlespinasse/github-slug-action@v3.x



# And you get this  => 
- name: Print slug/short variables
  run: |
    echo "Slug variables"
    echo " - ${{ env.GITHUB_REF_SLUG }}"    
    echo " - ${{ env.GITHUB_HEAD_REF_SLUG }}"
    echo " - ${{ env.GITHUB_BASE_REF_SLUG }}"
    echo " - ${{ env.GITHUB_REPOSITORY_SLUG }}"
    # output e.g. : master feat-new-feature v1.0.0 product-1.0.0-rc.2 new-awesome-product
    echo "Slug URL variables"
    echo " - ${{ env.GITHUB_REF_SLUG_URL }}"
    echo " - ${{ env.GITHUB_HEAD_REF_SLUG_URL }}"
    echo " - ${{ env.GITHUB_BASE_REF_SLUG_URL }}"
    echo " - ${{ env.GITHUB_REPOSITORY_SLUG_URL }}"
    # output e.g. : master feat-new-feature v1-0-0 product-1-0-0-rc-2 new-awesome-product
    echo "Short SHA variables"
    echo " - ${{ env.GITHUB_SHA_SHORT }}"
    # output e.g. : ffac537e