Merge pull request #661 from bashly-framework/fix/env-var-validation

Add misisng validation for `env_var.validate`

Author: DannyBen

lib/bashly/config_validator.rb

@@ -169,6 +169,7 @@ def assert_env_var(key, value)
       assert_boolean "#{key}.required", value['required']
       assert_boolean "#{key}.private", value['private']
       assert_array "#{key}.allowed", value['allowed'], of: :string
+      assert_optional_string "#{key}.validate", value['validate']
 
       refute value['required'] && value['default'], "#{key} cannot have both nub`required` and nub`default`"
     end