buildkite: don't build pmd lib outside of pmd phase (#6541)
buildkite: don't build pmd lib outside of pmd phase (#6541)


intentionet/batfish,batfish/batfish,batfish/batfish,intentionet/batfish,batfish/batfish,arifogel/batfish,intentionet/batfish,intentionet/batfish,arifogel/batfish,dhalperi/batfish,intentionet/batfish,dhalperi/batfish,arifogel/batfish,dhalperi/batfish