Recommend caching COMPOSER_CACHE_DIR over vendor/ #5
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Caching the vendor directory as-is could produce various unwanted and hard to debug problems.
For example:
vendor/autoload*
would not be dumped again based on new changes to code andcomposer.json
configurationvendor/installed.json
would not be updated with changes to Composer versionSee this thread which caused github.com/actions/cache to recommend not caching vendor, but instead cache the Composer cache dir: actions/cache#32 (comment) which is based on travis-ci/travis-ci#4579 (comment)