ambiguous argument unknown revision

[havok2063]

Subject of the issue

I have a very simple workflow where I want to periodically checkout the repo, check for updated files, and then submit a PR from a new branch into main, with any committed changes for the new files. I'd like it to create a new branch, dm_update_models, to commit the changes into. Currently the action runs, finds changes that need to be committed, but fails to create a new PR. I get the following error: fatal: ambiguous argument 'origin/dm_update_models': unknown revision or path not in the working tree. Does this action expect the branch to already exist or will it create it if needed? Originally, I did not have the base option set to main, but got the following error: The 'base' and 'branch' for a pull request must be different branches. Unable to continue. Am I missing something here?

Steps to reproduce

The current github action workflow

name: Update access models

on:
  schedule:
    - cron: '0 9 * * 1'

jobs:
  createpr:
    runs-on: ubuntu-latest
    steps:

      - name: Checkout code
        uses: actions/checkout@v3

      - name: Set up Python
        uses: actions/setup-python@v3
        with:
          python-version: 3.9

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install wheel
          pip install -e ".[dev, all]"

      - name: Update Models
        run: datamodel tree update

      - name: Create Pull Request
        id: cpr
        uses: peter-evans/create-pull-request@v4
        with:
          title: Auto update datamodel access
          body: |
            Updating new datamodels with access information.
            Auto-generated by [create-pull-request][1]

            [1]: https://github.com/peter-evans/create-pull-request
          base: main
          branch: dm_update_models
          delete-branch: true
          draft: true
          reviewers: havok2063
          labels: |
            auto-pr
            enhancement

      - name: Check outputs
        if: ${{ steps.cpr.outputs.pull-request-number }}
        run: |
          echo "Pull Request Number - ${{ steps.cpr.outputs.pull-request-number }}"
          echo "Pull Request URL - ${{ steps.cpr.outputs.pull-request-url }}"

and the full traceback

  /usr/bin/git symbolic-ref HEAD --short
  dm_update_models
  Working base is branch 'dm_update_models'
  /usr/bin/git checkout --progress -B 96f4a1f7-0ebc-4a12-8709-66b438a5cbbe HEAD --
  Switched to a new branch '96f4a1f7-0ebc-4a12-8709-66b438a5cbbe'
  M	datamodel/products/access/spXCSAO.access
  M	datamodel/products/json/spXCSAO.json
  M	datamodel/products/yaml/spXCSAO.yaml
  /usr/bin/git status --porcelain -unormal --
   M datamodel/products/access/spXCSAO.access
   M datamodel/products/json/spXCSAO.json
   M datamodel/products/yaml/spXCSAO.yaml
  Uncommitted changes found. Adding a commit.
  /usr/bin/git add -A
  /usr/bin/git -c author.name=havok2063 -c [email protected] -c committer.name=GitHub -c [email protected] commit -m [create-pull-request] automated change
  [96f4a1f7-0ebc-4a12-8709-66b438a5cbbe 2a8818e] [create-pull-request] automated change
   Author: havok2063 <[email protected]>
   3 files changed, 45 insertions(+), 14 deletions(-)
  /usr/bin/git reset --hard
  HEAD is now at 2a8818e [create-pull-request] automated change
  /usr/bin/git clean -f -d
  Resetting working base branch 'dm_update_models'
  /usr/bin/git checkout --progress dm_update_models --
  Switched to branch 'dm_update_models'
  /usr/bin/git reset --hard origin/dm_update_models
  fatal: ambiguous argument 'origin/dm_update_models': unknown revision or path not in the working tree.
  Use '--' to separate paths from revisions, like this:
  'git <command> [<revision>...] -- [<file>...]'
  Error: The process '/usr/bin/git' failed with exit code 128