ubuntu: add flang #373

Job	Run time
CI (fedora, latest-amd64)	43m 33s
CI (fedora, latest-arm64, true)	42m 53s
CI (fedora, rawhide, TAG=rawhide, true)	42m 53s
CI (ubuntu, latest-amd64)	40m 19s
CI (ubuntu, latest-arm64, true)	42m 44s
CI (ubuntu, rolling, TAG=rolling)	44m 3s
CI (ubuntu, devel, TAG=devel, true)	44m 38s
CI (ubuntu, intel, TAG=22.04,INTEL=yes, -DCMAKE_CXX_COMPILER=icpx -DCMAKE_CXX_FLAGS=-fp-model=pre...	51m 52s
CI (opensuse, latest)	43m 13s
merge-docker-manifest (fedora, latest)	2s
merge-docker-manifest (ubuntu, latest)	2s
	6h 36m 12s

Provide feedback