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Cannot find Alfresco Repository on this server. (Does this application have access to alfresco-global.properties? Does this application have cross-context permissions?)
You should share the error log instead of one liner. Although the error could be because you may have missed the step to setup "tomcat/shared" classpath and hence platform app is not able to locate alfresco-global.properties. Or dir.root/db properties are somehow not correct. Your dir.root and db properties needs to be available and should point to correct location and db.
$ sudo vim /usr/local/alfresco-community70/tomcat/conf/catalina.properties
shared.loader=${catalina.base}/shared/classes,${catalina.base}/shared/lib/*.jar
You can refer these detailed steps to setup in case that helps:
https://javaworld-abhinav.blogspot.com/2021/06/setup-acs70-ass201-and-transformation-service.html