Hi Dev team, I would like to start a new proposal about actions config changes from actions/checkout@v1 to actions/checkout@v2.
Sometime skywalking ci and e2e test in github actions will tigger "fatal: reference is not a tree”[1] when using actions/checkout@v1. Quote form "V2 fetches a specific SHA and retries with a few delays between before failing. Whereas V1 fetched the merge PR ref."[2]， seem problem above is solved in [email protected] submodule function has been removed from V2 version [3]. Whether subsequent submodule functions will be added is still unclear [4]. From the official documentation of checkout, there is a way to provide submodule functionality through the attachment command line in checkout@v2[5], Based on the above reasons, I submitted this PR[6] and all test passed. Since I am not familiar with actions/checkout, are there any other suggestions and problems? Welcome to give some suggestions. [1]https://github.com/actions/checkout/issues/23 [2]https://github.com/actions/checkout/issues/23#issuecomment-572688577 [3]https://github.com/actions/checkout/issues/81 [4]https://github.com/actions/checkout/issues/81#issuecomment-585935021 [5]https://github.com/actions/checkout#Checkout-submodules [6]https://github.com/apache/skywalking/pull/4419
