MM-27041: Do not run tests against both DBs in CI (#15060)

* MM-27041: Do not run tests against both DBs in CI

We already run the entire test suite for both mysql and postgres in parallel in CI.
So we just run the tests for the current database set.

* Fix incorrect env var

store/sqlstore/store_test.go

@@ -4,6 +4,7 @@
 package sqlstore
 
 import (
+	"os"
 	"sync"
 	"testing"
 
@@ -80,14 +81,31 @@ func initStores() {
 	if testing.Short() {
 		return
 	}
-	storeTypes = append(storeTypes, &storeType{
-		Name:        "MySQL",
-		SqlSettings: storetest.MakeSqlSettings(model.DATABASE_DRIVER_MYSQL),
-	})
-	storeTypes = append(storeTypes, &storeType{
-		Name:        "PostgreSQL",
-		SqlSettings: storetest.MakeSqlSettings(model.DATABASE_DRIVER_POSTGRES),
-	})
+	// In CI, we already run the entire test suite for both mysql and postgres in parallel.
+	// So we just run the tests for the current database set.
+	if os.Getenv("IS_CI") == "true" {
+		switch os.Getenv("MM_SQLSETTINGS_DRIVERNAME") {
+		case "mysql":
+			storeTypes = append(storeTypes, &storeType{
+				Name:        "MySQL",
+				SqlSettings: storetest.MakeSqlSettings(model.DATABASE_DRIVER_MYSQL),
+			})
+		case "postgres":
+			storeTypes = append(storeTypes, &storeType{
+				Name:        "PostgreSQL",
+				SqlSettings: storetest.MakeSqlSettings(model.DATABASE_DRIVER_POSTGRES),
+			})
+		}
+	} else {
+		storeTypes = append(storeTypes, &storeType{
+			Name:        "MySQL",
+			SqlSettings: storetest.MakeSqlSettings(model.DATABASE_DRIVER_MYSQL),
+		})
+		storeTypes = append(storeTypes, &storeType{
+			Name:        "PostgreSQL",
+			SqlSettings: storetest.MakeSqlSettings(model.DATABASE_DRIVER_POSTGRES),
+		})
+	}
 
 	defer func() {
 		if err := recover(); err != nil {