yml怎么从github的master下，上传文件big.zip 到公网linux server?

blackantt

参考
https://github.com/marketplace/actions/copy-via-ssh
Copy a single file to a remote server

- name: Copy single file to remote
        uses: garygrossgarten/github-action-scp@release
        with:
          local: test/oof.txt
          remote: scp/single/oof.txt
          host: ${{ secrets.HOST }}
          username: ${{ secrets.SSH_USER }}
          password: ${{ secrets.PASSWORD }}


参考
https://github.com/nicklasfrahm/scp-action
Uploading local files to remote target
name: upload

on:
  - push

jobs:
  upload:
    name: Upload
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository
        uses: actions/checkout@master

      - name: Upload file via SSH
        uses: nicklasfrahm/scp-action@main
        with:
          direction: upload
          host: ${{ secrets.SSH_TARGET_HOST }}
         
          username: ${{ secrets.SSH_USER }}
          key: ${{ secrets.SSH_PRIVATE_KEY }}
         
          source: |
            path/to/source/a.txt
            path/to/source/b.txt
          target: path/to/target

问题：
1.从main/master下上传，这个main或者master在yml的哪里体现？
2.运行yml时，下面这个选项是干嘛用的？



3.怎么知道，能否直接把密码写入yml, 还是必须用${}来调用？

blackantt

with:
  ref: master