add a step to CI in the node repo that will clone casper-deploy-generator

Recently I had to add some new features to casper-deploy-generator ([link](https://github.com/casper-ecosystem/casper-deploy-generator)) and the first PR became a maintanence one - updating deps, fixing compilation issues etc and there were actually new Key variants that were not covered by the Ledger app so far. Can we add a step to CI in the node repo that will clone casper-deploy-generator , runs make test-vectors and verify that there are no changes in the diff for that file? This should help with catching any changes that would break the Ledger app compatibility (edited)