Currently, the build pipeline runs for any changes, even though some changes are known as not affecting the build results. For instance,

1. A change in documentation won't affect the build results of PHPUnit tests, static analysis or coding standards check.
2. A change in the configuration of a certain tool (e.g. PHPUnit) won't affect other build tools (e.g. PHPStan).
3. A change driver- or platform-specific code won't affect the build results in other drivers or platforms.

With that in mind, we can annotate the build jobs with paths and paths-ignore (documentation).