chore(make): only run flutter tests

Allows Flutter tests to work once CI and presubmits are reenabled.

Change-Id: Iebf4bcec25a626decbde8e3056833f7117f11054
diff --git a/Makefile b/Makefile
index 5b16eb7..dc29dea 100644
--- a/Makefile
+++ b/Makefile
@@ -3,14 +3,23 @@
 GRADLE := ./android/gradlew
 
 .SHELLFLAGS := -eu -o pipefail -c
-.PHONY: clean cloudsync test
 
+.PHONY: cloudsync
 cloudsync:
 	$(MAKE) -C cloudsync
 
+.PHONY: clean
 clean:
-	$(GRADLE) -p android clean
-	$(MAKE) -C cloudsync clean
+	# Temporarily avoid Android related tasks.
+	# $(GRADLE) -p android clean
+	# $(MAKE) -C cloudsync clean
+	@true
 
+.PHONY: test
 test:
+	@echo "= Running flutter tests ="
+	$(MAKE) -C flutter test
+
+.PHONY: test-android
+test-android:
 	$(GRADLE) -p android test