CI: Python lint/test action breaks on fork

[brylie]

The "Python lint/test" CI pipeline fails on forked repositories with the following errors.

Example failure message

> Fetching the repository /usr/bin/git -c protocol.version=2 fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin +refs/heads/feat/106_add_django-linear-migrations*:refs/remotes/origin/feat/106_add_django-linear-migrations* +refs/tags/feat/106_add_django-linear-migrations*:refs/tags/feat/106_add_django-linear-migrations* The process '/usr/bin/git' failed with exit code 1 Waiting 19 seconds before trying again /usr/bin/git -c protocol.version=2 fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin +refs/heads/feat/106_add_django-linear-migrations*:refs/remotes/origin/feat/106_add_django-linear-migrations* +refs/tags/feat/106_add_django-linear-migrations*:refs/tags/feat/106_add_django-linear-migrations* The process '/usr/bin/git' failed with exit code 1 Waiting 19 seconds before trying again /usr/bin/git -c protocol.version=2 fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin +refs/heads/feat/106_add_django-linear-migrations*:refs/remotes/origin/feat/106_add_django-linear-migrations* +refs/tags/feat/106_add_django-linear-migrations*:refs/tags/feat/106_add_django-linear-migrations* Error: The process '/usr/bin/git' failed with exit code 1

Task

• fix the "python lint/test" pipeline so it can run against repository forks
• specifically, look at the checkout action and see if it is properly configured or whether an alternative exists

Related issues/resources

• Failing to commit to fork in pull requests actions/checkout#455
• Github Checkout action failing to find forked repository actions/checkout#551