README Example should indicate actions/checkout@master is required

[CdrMarks]

Describe the bug

The Example in README.md doesn't make it clear that -uses: actions/checkout@master is required. The comment "# Remove or modify this step as needed" introduces further confusion.

Steps to Reproduce

1. Add a file in .github/workflows/wordpress-plugin-deploy.yml

name: Release pantheon-hud plugin to wp.org
on:
  release:
    types: [published]
jobs:
  release:
    runs-on: ubuntu-latest
    steps:
    - name: WordPress Plugin Deploy
      uses: 10up/[email protected]
      env:
        SVN_USERNAME: ${{ secrets.SVN_USERNAME }}
        SVN_PASSWORD: ${{ secrets.SVN_PASSWORD }}
        SLUG: ${{ env.SLUG }}

2. See this error when publishing a release:

> Copying files...
ℹ︎ Using .gitattributes
fatal: not a git repository (or any of the parent directories): .git
fatal: not a git repository (or any of the parent directories): .git
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors
Error: Process completed with exit code 2.

Expected behavior

The action would deploy the code in the release to WordPress' SVN server.

Additional context

While debugging the action, we found these two comments on issues where others had done similar things.

• Request : Boilerplate plugin that implements this github action #11 (comment)

You’ve commented out the - uses: actions/checkout@master step, which is necessary to have any of the GitHub repo available for use during the run.

• Bug: fatal: not a git repository when no .gitattributes file is present #32 (comment)

You're missing the line - uses: actions/checkout@master in your tag deploy workflow :) Without that, it will not have any of the contents you're expecting, and it will not be a Git checkout.

[jspellman814]

Worth noting that actions/checkout@master is no longer in use, and has been converted to actions/checkout@main.

The example in the README (under Deploy on pushing a new tag) mentions actions/checkout@master.