Composer validation and PHP syntax check

The composer-lint job validates the project's composer.json file by executing the composer validate command.

It also uses the php-parallel-lint package to check the syntax of the module's PHP files. All files with an extension of .php, .inc, .module, and .install are checked.

If you need extra options for the command you can use the _PARALLEL_LINT_EXTRA variable. An example of this would be to add the --show-deprecated parameter which is off by default.