title: Tune recipe in workflow set with custom range (or value)
body: <p>I'm trying to use workflow_set() function in tidymodels to evaluate a batch of models.
  I've understand that is possible to modify some model specification in order to change the search range so, for example, given this specification:</p>
  <pre><code>spec_lin &lt;- linear_reg( penalty = tune(), 
                      mixture = tune()  ) %&gt;%
  set_engine('glmnet')
  </code></pre>
  <p>I can modify the range using:</p>
  <pre><code>rec_base &lt;- recipe( price ~ feat_1) %&gt;% 
    step_novel(feat_1) %&gt;% 
    step_other(feat_1,threshold=.2 ) %&gt;%
    step_dummy(feat_1)
  
  rec_adv_param &lt;- rec_base %&gt;% 
    parameters() %&gt;% 
    update ( mixture = mixture(c(0.1,0.01)) )
  </code></pre>
  <p>My attempt is to do the same but with the parameters in the recipe. For example:</p>
  <pre><code>rec_tuned &lt;- recipe( price ~ feat_1) %&gt;% 
    step_novel(feat_1) %&gt;% 
    step_other(feat_1,threshold=tune() ) %&gt;%
    step_dummy(feat_1)
  </code></pre>
  <p>followed by</p>
  <pre><code>rec_adv_param &lt;- rec_tuned %&gt;% 
    parameters() %&gt;% 
    update ( threshold = threshold(c(0.1,0.2)) )
  </code></pre>
  <p>However when I try to use it in the workflow_set() definition if I use something like</p>
  <pre><code>wf_set  &lt;- workflow_set(recipes, models, cross = TRUE ) 
    option_add(param_info = rec_adv_param, id = &quot;rec_tuned_spec_lin&quot;) 
  </code></pre>
  <p>The finale &quot;wf_set&quot; lost his original tuning parameters the has been changed with the</p>
  <pre><code>threshold = threshold(c(0.1,0.2)
  </code></pre>
  <p>Is there a way to add the parameters specification for the recipe in all workflow_set models?</p>
  <p>Thanks</p>