feature: default to running vendored phpstan

Author: Greg Bowler

README.md

@@ -45,7 +45,7 @@ Inputs
 
 The following configuration options are available:
 
-+ `version` The version of PHPStan to use e.g. `9` or `9.5.0` (default: latest)
++ `version` The version of PHPStan to use e.g. `9`, `9.5.0`, `latest` or `composer` (default: `composer` will use the version in your `vendor/bin` directory)
 + `php_version` The version of PHP to use e.g. `7.4` (default: latest)
 + `php_extensions` Space-separated list of extensions using [php-build][php-build] e.g. `xdebug mbstring` (default: N/A)
 + `vendored_phpstan_path` The path to a phar file already present on the runner (default: N/A)

action.yml

@@ -4,7 +4,7 @@ description: PHP Static Analysis in Github Actions.
 inputs:
   version:
     description: What version of PHPStan to use
-    default: latest
+    default: composer
     required: false
 
   php_version:

phpstan-action.bash

@@ -4,6 +4,11 @@ github_action_path=$(dirname "$0")
 docker_tag=$(cat ./docker_tag)
 echo "Docker tag: $docker_tag" >> output.log 2>&1
 
+if [ "$ACTION_VERSION" = "composer" ]
+then
+	ACTION_PHPSTAN_PATH="${GITHUB_WORKSPACE}/vendor/bin/phpstan"
+fi
+
 if [ -z "$ACTION_PHPSTAN_PATH" ]
 then
 	phar_url="https://www.getrelease.download/phpstan/phpstan/$ACTION_VERSION/phar"