Add Rector/Project Update Bot job
It would be awesome to have a project update bot job (or rector job i guess) that will generate a patch to use for your project. That would enable users to run rector when they want on the branch that they want.
This has been a long standig wish, lets track it here.
How to run locally (Mac ARM fix included...):
```
DOCKER_DEFAULT_PLATFORM=linux/amd64 gitlab-ci-local rector \
--variable="_GITLAB_TEMPLATES_REPO=issue/gitlab_templates-3572410" \
--variable="_GITLAB_TEMPLATES_REF=3572410-issue-branch" \
--variable="_CURL_TEMPLATES_REPO=issue/gitlab_templates-3572410" \
--variable="_CURL_TEMPLATES_REF=3572410-issue-branch" \
--fetch-includes --needs --shell-isolation
```
issue