Switch to Postgres when running tests and turn off the fsync setting (#13678)

* Run all tests fasts in postgres

* Moving postgres config to a file

* Addressing PR review comments

* Testing against mysql in the CI to keep things less changed

* Revert "Testing against mysql in the CI to keep things less changed"

This reverts commit fc940c111db269a821c54e005d76df87cb70e031.

* Fixing a test broken in postgres but working in mysql

* Fixing some tests

* Fixing some config tests with postgres

* Fixing the rest of config tests

* Fixing govet error

* Fixing search tests for postgres

testlib/helper.go

@@ -95,7 +95,7 @@ func (h *MainHelper) Main(m *testing.M) {
 func (h *MainHelper) setupStore() {
 	driverName := os.Getenv("MM_SQLSETTINGS_DRIVERNAME")
 	if driverName == "" {
-		driverName = model.DATABASE_DRIVER_MYSQL
+		driverName = model.DATABASE_DRIVER_POSTGRES
 	}
 
 	h.Settings = storetest.MakeSqlSettings(driverName)
@@ -116,6 +116,9 @@ func (h *MainHelper) setupResources() {
 }
 
 func (h *MainHelper) Close() error {
+	if h.SQLSupplier != nil {
+		h.SQLSupplier.Close()
+	}
 	if h.Settings != nil {
 		storetest.CleanupSqlSettings(h.Settings)
 	}