Each run of releaser-pleaser acts on the same global state in the
forge. Therefore, parallel runs are unnecessary.
This commit also communicates to the GitHub and GitLab CI pipelines that
the releaser-pleaser jobs can be cancelled as early as possible.
- On GitHub Actions this can be guaranteed through the workflow
settings. These settings are copied into each repository that uses
releaser-pleaser, so users need to update this manually. I will add a
note to the release notes for this.
- On GitLab CI/CD this requires the user to configure a project level setting to
"auto-cancel redundant pipelines". We will not recommend user to set
this, as it is quite invasive and can break their regular CI pipelines.
