This allows running PHPStan within Docker environment and output errors with links to files on the host (editorUrl must be configured using actual host's path to the project + %rel_file%).

Fixes phpstan/phpstan#7043

I decided to use %rel_file% because there was RelativePathHelper already in the formatter, so it was almost non-invasive. Other options would require much more work and many other files modified.

I wanted to add test for it, but honestly I don't know how to do it 🤔 I created test similar to TableErrorFormatterTest::testEditorUrlWithTrait() but flow of outputting errors does not allow to check if href added to message is correct - it's missing in the output retrieved with $this->getOutputContent(). Anyway, I was able to test it with Docker runtime created locally and it works:

# phpstan.neon
includes:
	- phpstan.neon.dist

parameters:
	editorUrl: 'phpstorm://open?file=/Volumes/Projects/~Github/phpstan/phpstan-src/%%rel_file%%&line=%%line%%'

Screenshot shows PHPStan analysis within Docker container, at the bottom you can see tooltip with href that is shown when mouse cursor is over the activated link - it's proper host's path, not container's one (which is /etc/phpstan/...).

FYI: ~/Dev is a symlink to /Volumes/Projects/, if CLI prompt looks suspicious 😉