[MM-17703] Diff config files (#11898)

Makefile

@@ -1,4 +1,4 @@
-.PHONY: build package run stop run-client run-server stop-client stop-server restart restart-server restart-client start-docker clean-dist clean nuke check-style check-client-style check-server-style check-unit-tests test dist prepare-enteprise run-client-tests setup-run-client-tests cleanup-run-client-tests test-client build-linux build-osx build-windows internal-test-web-client vet run-server-for-web-client-tests
+.PHONY: build package run stop run-client run-server stop-client stop-server restart restart-server restart-client start-docker clean-dist clean nuke check-style check-client-style check-server-style check-unit-tests test dist prepare-enteprise run-client-tests setup-run-client-tests cleanup-run-client-tests test-client build-linux build-osx build-windows internal-test-web-client vet run-server-for-web-client-tests diff-config
 
 ROOT := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
 
@@ -410,6 +410,9 @@ config-reset: ## Resets the config/config.json file to the default.
 	rm -f config/config.json
 	OUTPUT_CONFIG=$(PWD)/config/config.json go generate ./config
 
+diff-config: ## Compares default configuration between two mattermost versions
+	@./scripts/diff-config.sh
+
 clean: stop-docker ## Clean up everything except persistant server data.
 	@echo Cleaning