New topic with the new version of discourse and without any local mods required on the config files.
Looks like the devs have resolved the Plesk+Docker+nGinx config for SSL
Nice to have an update go smoothly 
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plesk update and appears to have not broken it this time …
another large update, and now worked out the mapping in the nginx config so I can fix the https stuff in one line 
cake rebuild check on posts