Gitaly requires go 1.12
Job #366635083 failed for 9fe268c9:
# go install
# gitlab.com/gitlab-org/gitaly/internal/metadata/featureflag
internal/metadata/featureflag/grpc_header.go:38:42: undefined: strings.ReplaceAll
note: module requires Go 1.12Makefile:51: recipe for target 'build' failed
make[1]: *** [build] Error 2
make[1]: Leaving directory '/builds/gitlab-org/gitlab/tmp/tests/gitaly/_build'
make: *** [build] Error 2
Makefile:25: recipe for target 'build' failed
It looks like out image does not have go 1.12