fix(kitchen): Provide a 'Policy.rb'

STATE:
To enable kitchen-test, a 'Policy.rb' needs to be present.

Signed-off-by: Jeremy MAURO <jeremy.mauro@gmail.com>

Policyfile.rb

@@ -0,0 +1 @@
+base.rb

cookbooks/workstation/metadata.rb

@@ -12,6 +12,8 @@ chef_version '>= 16.0'
 #
 # issues_url 'https://github.com/<insert_org_here>/workstation/issues'
 depends 'etckeeper'
+depends 'git'
+depends 'github'
 
 # The `source_url` points to the development repository for this cookbook.  A
 # `View Source` link will be displayed on this cookbook's page when uploaded to