implement xml linting
also, check that at least one job is created for a MR pipeline because: no job => no merge
hint: xmllint is in package libxml2-utils
in deb/ubu as well as in alp
also, check that at least one job is created for a MR pipeline because: no job => no merge
hint: xmllint is in package libxml2-utils
in deb/ubu as well as in alp