How to checkout "master" in addition to latest PR commit?

[pepoluan]

Currently I have the following steps in my GA workflow:

      - name: "Checkout latest PR commit"
        uses: actions/checkout@v2
      - name: "Set up Python"
        uses: actions/setup-python@v2
        with:
          python-version: 3.8
      - name: "Update modules & install deps"
        # language=bash
        run: |
          python -m pip install --upgrade pip setuptools wheel
          python setup.py develop
      - name: "flake8 Style Checking"
        # language=bash
        run: |
          pip install colorama flake8
          python -m flake8 aiosmtpd setup.py housekeep.py release.py
      - name: "Static Type Checking"
        # language=bash
        run: |
          pip install pytype
          pytype --keep-going --jobs auto .
      - name: "Other QA Checks"
        # language=bash
        run: |
          pip install pytest pytest-mock check-manifest
          pytest -v aiosmtpd/qa
          check-manifest -v

Now, one of the tests need to access the master branch. I've tried adding another checkout step, like so:

      - name: "Checkout latest master"
        uses: actions/checkout@v2
        with:
          ref: "master"
      - name: "Checkout latest PR commit"
        uses: actions/checkout@v2

But that checkout step got nuked when the second step began:

Removing previously created refs, to avoid conflicts
  /usr/bin/git rev-parse --symbolic-full-name --verify --quiet HEAD
  refs/heads/master
  /usr/bin/git checkout --detach
  HEAD is now at b47eeb0 Fix RTD requirements.txt and bump
  /usr/bin/git rev-parse --symbolic-full-name --branches
  refs/heads/master
  /usr/bin/git branch --delete --force master
  Deleted branch master (was b47eeb0).

So how do I checkout both master and the latest PR commit?

[yahel2410]

I think you can use the path input to specify another dir for the master checkout. E.g:

      - name: "Checkout latest master"
        uses: actions/checkout@v3
        with:
          ref: "master"
          path: "./master-branch`          # <======== here
      - name: "Checkout latest PR commit"
        uses: actions/checkout@v3

Notice that I use v3 of the actions/checkout action