Ignore issue template with a special name #21830
                
     Merged
            
            
          
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A file in
ISSUE_TEMPLATEwith the nameconfig.ymlshouldn't be treated as a YAML template, it's for configuring the template chooser.The old code tried to ignore the file, but it didn't work, caused by #20987. That's why the warning is displayed:
Note that this PR is not an implementation of
config.yml, there will be another one to do it.