Try using pcov instead of phpdbg for code coverage (#22174)

It doesn't seem to be that much faster, but it doesn't seem to have the
segfaulting problem that phpdbg has been giving us lately.

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/1616131653

CHANGELOG.md

@@ -5,6 +5,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.1-alpha] - unreleased
+
+This is an alpha version! The changes listed here are not final.
+
+### Changed
+- Switch to pcov for code coverage.
+
 ## 1.0.0 - 2021-12-22
 ### Added
 - Initial release.
+
+[1.0.1-alpha]: https://github.com/Automattic/ignorefile/compare/v1.0.0...v1.0.1-alpha

composer.json

@@ -20,7 +20,7 @@
 		],
 		"test-coverage": [
 			"@composer install",
-			"phpdbg -d memory_limit=2048M -d max_execution_time=900 -qrr ./vendor/bin/phpunit --coverage-clover \"$COVERAGE_DIR/clover.xml\""
+			"php -dpcov.directory=. ./vendor/bin/phpunit --coverage-clover \"$COVERAGE_DIR/clover.xml\""
 		],
 		"test-php": [
 			"@composer install",