feat: re-generate plantuml images in CI

Makefile

@@ -607,7 +607,7 @@ APIDIFF_OLD_COMMIT ?= $(shell git rev-parse origin/main)
 apidiff: $(GO_APIDIFF) ## Check for API differences
 	$(GO_APIDIFF) $(APIDIFF_OLD_COMMIT) --print-compatible
 
-ALL_VERIFY_CHECKS = licenses boilerplate shellcheck tiltfile modules gen conversions doctoc capi-book-summary
+ALL_VERIFY_CHECKS = licenses boilerplate shellcheck tiltfile modules gen conversions doctoc capi-book-summary diagrams
 
 .PHONY: verify
 verify: $(addprefix verify-,$(ALL_VERIFY_CHECKS)) lint-dockerfiles ## Run all verify-* targets
@@ -674,6 +674,13 @@ verify-govulncheck: $(GOVULNCHECK) ## Verify code for vulnerabilities
 		exit 1; \
 	fi
 
+.PHONY: verify-diagrams
+verify-diagrams: generate-diagrams ## Verify generated diagrams are up to date
+	@if !(git diff --quiet HEAD); then \
+		git diff; \
+		echo "generated diagrams are out of date, run make generate-diagrams"; exit 1; \
+	fi
+
 .PHONY: verify-security
 verify-security: ## Verify code and images for vulnerabilities
 	$(MAKE) verify-container-images && R1=$$? || R1=$$?; \