feat(gemfile): update for formulas with Vagrant testing

ssf/defaults.yaml

@@ -22,8 +22,8 @@ ssf_node_anchors:
             #       An alternative method could be to use:
             #       `git describe --abbrev=0 --tags`
             # yamllint disable rule:line-length rule:quoted-strings
-            title: "ci(kitchen): avoid using bootstrap for '`'master'`' instances"
-            body: '* Automated using https://github.com/myii/ssf-formula/pull/124'
+            title: "ci(gemfile): update for Vagrant testing [skip ci]"
+            body: '* Automated using https://github.com/myii/ssf-formula/pull/125'
             # yamllint enable rule:line-length rule:quoted-strings
           github:
             owner: 'saltstack-formulas'

ssf/files/tofs_openssh-formula/Gemfile

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+gem 'kitchen-docker', '>= 2.9'
+gem 'kitchen-inspec', '>= 1.1'
+gem 'kitchen-salt', '>= 0.6.0'
+gem 'rspec-retry'
+# Latest versions of `train` cause failure when running `kitchen verify`
+# Downgrading to `3.2.0` until this is fixed upstream
+# https://github.com/inspec/train/pull/544#issuecomment-566055052
+gem 'train', '3.2.0'
+
+group :vagrant do
+  gem 'kitchen-vagrant'
+end

ssf/files/tofs_postgres-formula/Gemfile

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+gem 'kitchen-docker', '>= 2.9'
+gem 'kitchen-inspec', '>= 1.1'
+gem 'kitchen-salt', '>= 0.6.0'
+gem 'rspec-retry'
+# Latest versions of `train` cause failure when running `kitchen verify`
+# Downgrading to `3.2.0` until this is fixed upstream
+# https://github.com/inspec/train/pull/544#issuecomment-566055052
+gem 'train', '3.2.0'
+
+group :vagrant do
+  gem 'kitchen-vagrant'
+end