Upgrade Go build to 1.8.x

Prometheus 1.6.x requires Go 1.8.x to build.

@nick.thomas Do gitlab-pages, es-indexer build on Go 1.8?

@jacobvosmaer-gitlab Do workhorse and gitaly build on Go 1.8?

@bjk-gitlab Do all exporters build on 1.8?

One remaining question is Registry, we need to upgrade the version !1513 (merged) before we bump the version of Go.

mentioned in merge request !1495 (merged)

Double checked, yes, all of the included exporters build on 1.8.

@marin we test them against go1.8 so they should be fine:

• Pages: https://gitlab.com/gitlab-org/gitlab-pages/builds/14926469
• es-git-go: https://gitlab.com/gitlab-org/gitlab-elasticsearch-indexer/builds/14617851
• workhorse: https://gitlab.com/gitlab-org/gitlab-workhorse/builds/14994823
• gitaly: https://gitlab.com/gitlab-org/gitaly/builds/15054019

What @nick.thomas said. :)

Edit: I could add I do development on gitaly and workhorse using go 1.8, but that is on darwin, not linux.

Still I don't foresee any build problems with 1.8.

Thanks all. We will check the Registry and push the go 1.8 through.

added Internal Maintenance and removed prometheus labels

mentioned in merge request !1513 (merged)

mentioned in merge request gitlab-omnibus-builder!40 (merged)

assigned to @balasankarc

Here are package builds using Go 1.8.1 (ignore OpenSUSE 42.1. It failed because the image creation failed): https://dev.gitlab.org/gitlab/omnibus-gitlab/pipelines/48005

The temporary images are here: https://gitlab.com/balasankarc/gitlab-omnibus-builder/container_registry

added Unscheduled label

closed via commit gitlab-omnibus-builder@67885435

mentioned in merge request !1523 (merged)

mentioned in commit tnir/omnibus-gitlab@09e71a4e

mentioned in issue gitaly#203 (closed)