Add wrapper script for phpcbf to convert 1 exit code to 0 exit code

Fixes #2111

bin/phpcbf.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Wrap phpcbf to turn 1 success exit code into 0 code.
+# See https://github.com/squizlabs/PHP_CodeSniffer/issues/1818#issuecomment-354420927
+
+root=$( dirname "$0" )/..
+
+"$root/vendor/bin/phpcbf" $@
+exit=$?
+
+# Exit code 1 is used to indicate that all fixable errors were fixed correctly.
+if [[ $exit == 1 ]]; then
+	exit=0
+fi
+
+exit $exit

package.json

@@ -107,7 +107,7 @@
     "lint:js": "wp-scripts lint-js .",
     "lint:js:fix": "npm run lint:js -- --fix",
     "lint:php": "vendor/bin/phpcs",
-    "lint:php:fix": "vendor/bin/phpcbf",
+    "lint:php:fix": "./bin/phpcbf.sh",
     "lint:pkg-json": "wp-scripts lint-pkg-json . --ignorePath .gitignore",
     "start": "wp-scripts start",
     "test": "npm-run-all --parallel test:*",