Upgrade Gitaly to 1.68.0

See merge request gitlab-org/gitlab-shell!347

Gitaly 1.68.0 upgrades gRPC to 1.24.0

Remove ruby tag from .gitlab-ci.yml

See merge request gitlab-org/gitlab-shell!345

Version 10.1.0

See merge request gitlab-org/gitlab-shell!344

Remove buildCheckAllowedEnv() test helper

Closes #215

See merge request gitlab-org/gitlab-shell!343

Rewrite `bin/check` in Go

See merge request gitlab-org/gitlab-shell!341

Decouple `bin/compile` and `bin/install` from code in `lib/`

See merge request gitlab-org/gitlab-shell!340

Remove deprecated create-hooks script

See merge request gitlab-org/gitlab-shell!342

This commit duplicates a small amount of Ruby code that is run at build
or install time. Over time, it would be nice to remove the dependency
on Ruby for these steps, but the focus right now is on run-time.

We'll be removing lib/* from gitlab-shell very soon, and these commands
need to keep working when we do.

Extend group IP restriction to Git activity

See merge request gitlab-org/gitlab-shell!335

Remove an obsolete section from config.yml.example

See merge request gitlab-org/gitlab-shell!339

Remove feature flags and the fallback command

See merge request gitlab-org/gitlab-shell!336

Build against go1.13

See merge request gitlab-org/gitlab-shell!337

Release v10.0.0

See merge request gitlab-org/gitlab-shell!333

Remove gitlab-keys script

See merge request gitlab-org/gitlab-shell!329