add a github action to compare the XML outputs between the base branch and the PR branch#1432

MatthewPyle-NOAA merged 8 commits intoNOAA-EMC:rrfs-mpas-jediNOAA-EMC/rrfs-workflow:rrfs-mpas-jedifrom

guoqing-noaa:test_xml_diffsguoqing-noaa/rrfs-workflow:test_xml_diffsCopy head branch name to clipboard