Fix passing --env-cwd arg by preceding with --

Co-authored-by: Joe McGill <[email protected]>

.github/workflows/php-test.yml

@@ -68,7 +68,7 @@ jobs:
       - name: Install WordPress
         run: npm run wp-env start
       - name: Composer install
-        run: npm run wp-env run tests-cli --env-cwd='wp-content/plugins/$(basename $(pwd))' composer install --no-interaction
+        run: npm run wp-env run tests-cli -- --env-cwd='wp-content/plugins/$(basename $(pwd))' composer install --no-interaction
       - name: Running single site unit tests
         run: npm run test-php
       - name: Running multisite unit tests