Fallback to build if pull fails

Makefile

@@ -17,8 +17,7 @@ help: ## Display this help which is generated from Make goal comments
 # Docker images are currently not public. So we build if pull fails for the local use case.
 .PHONY: setup
 setup:
-	-@docker-compose pull
-	@docker-compose build
+	-@docker-compose pull || docker-compose build
 
 .PHONY: clean
 clean: ## Clean cached jekyll files
@@ -43,6 +42,7 @@ build: ## Build site for deployment
 .PHONY: tests
 tests: setup
 tests: ## Serve, then run link checker. Times out after 5 minutes.
+	-@docker-compose pull linkchecker || docker-compose build linkchecker
 	@echo COMMAND="-u http://jekyll:4998/ -b \"\" -p 4998 serve" > .env
 	@docker-compose --profile test up --abort-on-container-exit
 	@rm -rf .env