pohly: logs: add AddGoFlags

JobBuild
6f3e5e30
01-24 14:01		 114731
12-28 21:52		 4d43fecd
12-28 21:50
pull-kubernetes-conformance-kind-ga-only-parallel 1618028847972749312 1617885327404306432 1608218826686599168
pull-kubernetes-dependencies 1618028847695925248 1617885327148453888 1608218826384609280
pull-kubernetes-e2e-gce 1618028847750451200 1617885327194591232 1608218826443329536
pull-kubernetes-e2e-gce-100-performance 1618028848140521472 1617885327572078592 1608218826879537152
pull-kubernetes-e2e-kind 1618028847859503104 1617885327303643136 1608218826569158656
pull-kubernetes-e2e-kind-ipv6 1618028847914029056 1617885327349780480 1608218826619490304
pull-kubernetes-integration 1618028847809171456 1617885327253311488 1608218826497855488
pull-kubernetes-node-e2e-containerd 1618028848073412608 1617885327504969728 1608218826795651072
pull-kubernetes-typecheck 1618028848195047424 1617885327618215936 1608218826921480192
pull-kubernetes-unit 1618028848018886656 1617885327454638080 1608646043967164416 1608218826736930816
pull-kubernetes-verify 1618028849377841152 1617885328817786880 1608218828045553664
pull-kubernetes-verify-govet-levee 1618028848530591744 1617885327970537472 1608218827194109952