Hint when author concats different types into a string

[pivotaljohn]

Describe the problem/challenge you have

Message:               unable to stamp object for resource [source-scanner] in supply chain [source-test-scan-to-url]: unable to apply ytt template: ytt: Error: 
- unknown binary op: string + int
    in <toplevel>
      stdin.yml:6 |   name: #@ data.values.workload.metadata.name + "-" + i     

Describe the solution you'd like

 Message:               unable to stamp object for resource [source-scanner] in supply chain [source-test-scan-to-url]: unable to apply ytt template: ytt: Error:  
 - unknown binary op: string + int
     in <toplevel>
       stdin.yml:6 |   name: #@ data.values.workload.metadata.name + "-" + i     
+      (hint: to concatenate non-string values in a string, use str() or string.format())

Anything else you would like to add:

Source: https://kubernetes.slack.com/archives/CH8KCCKA5
A continuation of: #509

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