fixup! Update Makefile targets dependencies

Makefile

@@ -441,14 +441,17 @@ simulators/dps: simulators/dps/clean
 simulators/clean: simulators/dps/clean
 simulators: simulators/dps
 
-env: clean certificates nats privateKeys http-gateway-www simulators
+env: clean certificates nats privateKeys http-gateway-www mongo simulators
 env/test/mem: clean certificates nats privateKeys
 
 ifeq ($(TEST_DATABASE),mongodb)
-env: mongo
-env/test/mem: mongo
+# github runners run out of file space if multiple mongodb replicas are started, so we start only a single instance
+env/test/mem: mongo-no-replicas
 else
+# test uses mongodb for most tests, but scylla can be enabled for some; so we always need mongodb to be running
+# but scylla needs to be started only if TEST_DATABASE=cqldb
 env: scylla
+# test/mem uses either mongodb or scylla, so just one needs to be started
 env/test/mem: scylla
 endif