Add PHP version as optional action input #63
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Psalm allows us to specify the PHP version it analyzes code against. Exposing this option allows users of this action to supply a matrix of PHP options to enable Psalm runs against each of the PHP versions they would like to support, or just to analyze against a specific version of PHP that differs from the container's installed version.
This provides a partial solution for #60, as the container-installed PHP version would no longer limit the versions Psalm could analyze against.