chore(ci): add golangci-lint #3

Annotations

10 errors

`(*VaultReadQuery).readSecret` - `opts` is unused (unparam)

import 'github.com/hashicorp/consul/sdk/testutil' is not allowed from list 'Main' (depguard)

import 'github.com/stretchr/testify/assert' is not allowed from list 'Main' (depguard)

import 'github.com/stretchr/testify/require' is not allowed from list 'Main' (depguard)

import 'github.com/hashicorp/consul-template/config' is not allowed from list 'Main' (depguard)

import 'github.com/hashicorp/consul-template/logging' is not allowed from list 'Main' (depguard)

import 'github.com/hashicorp/consul-template/manager' is not allowed from list 'Main' (depguard)

import 'github.com/hashicorp/consul-template/service_os' is not allowed from list 'Main' (depguard)

import 'github.com/hashicorp/consul-template/signals' is not allowed from list 'Main' (depguard)

import 'github.com/hashicorp/consul-template/version' is not allowed from list 'Main' (depguard)