Yes, pentaho-server-9.1 can be used for any 9.x version. Main consideration is to use corresponding installation packages based on desired version.
There aren't major considerations between 9.1 and 9.2 in terms of configuration and installation procedure.
Has there been any testing on 9.2 on this docker builds and deployments? If we are targeting 9.2 is it safe to work from this github repo?
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