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1. 常用的Actions

1. checkout

https://github.com/actions/checkout

在工作流工作空间中，只有执行该Actions工作空间中才会有仓库代码，否则无法访问到仓库。因此该Actions通常写在比较前

- uses: actions/checkout@v2  with:    # Repository name with owner. For example, actions/checkout    # Default: ${
   { github.repository }}    repository: ''    # The branch, tag or SHA to checkout. When checking out the repository that    # triggered a workflow, this defaults to the reference or SHA for that event.    # Otherwise, uses the default branch.    ref: ''    # Personal access token (PAT) used to fetch the repository. The PAT is configured    # with the local git config, which enables your scripts to run authenticated git    # commands. The post-job step removes the PAT.    #    # We recommend using a service account with the least permissions necessary. Also    # when generating a new PAT, select the least scopes necessary.    #    # [Learn more about creating and using encrypted secrets](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets)    #    # Default: ${
   { github.token }}    token: ''    # SSH key used to fetch the repository. The SSH key is configured with the local    # git config, which enables your scripts to run authenticated git commands. The    # post-job step removes the SSH key.    #    # We recommend using a service account with the least permissions necessary.    #    # [Learn more about creating and using encrypted secrets](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets)    ssh-key: ''    # Known hosts in addition to the user and global host key database. The public SSH    # keys for a host may be obtained using the utility `ssh-keyscan`. For example,    # `ssh-keyscan github.com`. The public key for github.com is always implicitly    # added.    ssh-known-hosts: ''    # Whether to perform strict host key checking. When true, adds the options    # `StrictHostKeyChecking=yes` and `CheckHostIP=no` to the SSH command line. Use    # the input `ssh-known-hosts` to configure additional hosts.    # Default: true    ssh-strict: ''    # Whether to configure the token or SSH key with the local git config    # Default: true    persist-credentials: ''    # Relative path under $GITHUB_WORKSPACE to place the repository    path: ''    # Whether to execute `git clean -ffdx && git reset --hard HEAD` before fetching    # Default: true    clean: ''    # Number of commits to fetch. 0 indicates all history for all branches and tags.    # Default: 1    fetch-depth: ''    # Whether to download Git-LFS files    # Default: false    lfs: ''    # Whether to checkout submodules: `true` to checkout submodules or `recursive` to    # recursively checkout submodules.    #    # When the `ssh-key` input is not provided, SSH URLs beginning with    # `git@github.com:` are converted to HTTPS.    #    # Default: false    submodules: ''