Build/Test Tools: Ignore the .envlite/ state directory.

envlite stores its per-checkout private state (port cache, manifest)
in `.envlite/` at the repo root. The directory is local working state
and must not be tracked.

Author: lucatume

.gitignore

@@ -28,6 +28,7 @@ wp-tests-config.php
 /jsdoc
 /composer.lock
 /vendor
+/.envlite/
 /src/wp-admin/css/*.min.css
 /src/wp-admin/css/*-rtl.css
 /src/wp-admin/css/colors/*/*.css