Jonathan Desrosiers 6e49ac2e96 Build/Test Tools: Install WordPress Importer plugin when installing the Docker-based local environment.
The WordPress Importer plugin is now downloaded to the `tests/phpunit/data/plugins` directory when running `npm run env:install`.

This ensures that the PHPUnit test suite will not fail when the plugin is missing.

This also introduces a new `WP_IMPORTER_REVISION` variable to the `.env` file, to control the SVN revision that is checked out.

Props johnbillion.
Fixes #49720.

git-svn-id: https://develop.svn.wordpress.org/trunk@50285 602fd350-edb4-49c9-b593-d223f7449a82
2021-02-10 16:52:13 +00:00
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