Add environment-to-ini to docker image (#14762)

* Add environment-to-app.ini routine

* Call environment-to-ini in docker setup scripts

* Automatically convert section vars to lower case to match documentation

* Remove git patch instructions

* Add env variable documentation to Install Docker

contrib/environment-to-ini/environment-to-ini.go

@@ -224,5 +224,6 @@ func DecodeSectionKey(encoded string) (string, string) {
 	} else {
 		key += remaining
 	}
+	section = strings.ToLower(section)
 	return section, key
 }