Can not publish action to marketplace

I am unable to publish my action to the marketplace.
Repo: GitHub - kevinsawade/python-todo-to-issue: This github action looks for todos in new commits and posts them as issues. Once the todos are removed the issues are closed.

action.yml

name: "Python todo to issue action"
author: "Kevin Sawade <kevin.sawade@uni-konstanz.de>"
description: "Converts todos from comments and google-style docstrings to issues."
runs:
  using: "docker"
  image: "Dockerfile"
branding:
  icon: "check-square"
  color: "orange"
inputs:
  testing:
    description: "For testing purposes. Let's the workflow run unittests."
    required: false
    default: false
  token:
    description: "The GitHub access token."
    required: true
  close_issues:
    description: "Whether to automatically close issues, that have been deleted in source code files."
    required: false
    default: true
   repo:
    description: "The path to the repository where the action will be used, e.g. 'kevinsawade/my-repo'."
    required: false
    default: "${{ github.repository }}"
  before:
    description: "The SHA of the last pushed commit."
    required: false
    default: "${{ github.event.before }}"
  sha:
    description: "The SHA of the latest commit."
    required: false
    default: "${{ github.sha }}"

Dockerfile:

FROM python:3
COPY main.py /main.py
COPY requirements.txt /requirements.txt
RUN python -m pip install --upgrade pip
RUN pip install -r /requirements.txt
ENTRYPOINT ["python", "/main.py"]

Draft a release:

With a reformat of the yaml file, it seems to work.