Properly run the validation test suite in CI

Author: TysonAndre

ci/run_tests_dockerized.sh

@@ -14,4 +14,7 @@ PHP_VERSION=$1
 
 DOCKER_IMAGE="tolerant-php-parser-test-runner:$PHP_VERSION"
 docker build --build-arg="PHP_VERSION=$PHP_VERSION" --tag="$DOCKER_IMAGE" -f ci/Dockerfile .
-docker run --rm $DOCKER_IMAGE ci/run_tests.sh
+# Run all of the phpunit test suites in CI.
+# - Add the validation folder as a read-only volume for running "phpunit --testsuite validation"
+#   (This is around 180MB, so it is not added to the docker image)
+docker run --volume="$PWD/validation:/tolerant-php-parser/validation:ro" --rm $DOCKER_IMAGE ci/run_tests.sh