testserver/datastore: default to mysql8, check arm

internal/testserver/datastore/mysql.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"runtime"
 	"testing"
 
 	"github.com/google/uuid"
@@ -44,7 +45,11 @@ type MySQLTesterOptions struct {
 // RunMySQLForTesting returns a RunningEngineForTest for the mysql driver
 // backed by a MySQL instance with RunningEngineForTest options - no prefix is added, and datastore migration is run.
 func RunMySQLForTesting(t testing.TB, bridgeNetworkName string) RunningEngineForTest {
-	return RunMySQLForTestingWithOptions(t, MySQLTesterOptions{Prefix: "", MigrateForNewDatastore: true}, bridgeNetworkName)
+	return RunMySQLForTestingWithOptions(t, MySQLTesterOptions{
+		Prefix:                 "",
+		MigrateForNewDatastore: true,
+		UseV8:                  true,
+	}, bridgeNetworkName)
 }
 
 // RunMySQLForTestingWithOptions returns a RunningEngineForTest for the mysql driver
@@ -54,7 +59,9 @@ func RunMySQLForTestingWithOptions(t testing.TB, options MySQLTesterOptions, bri
 	require.NoError(t, err)
 
 	containerImageTag := "5"
-	if options.UseV8 {
+	if runtime.GOARCH == "arm64" && !options.UseV8 {
+		t.Fatal("MySQL 5 does not support arm64")
+	} else if options.UseV8 {
 		containerImageTag = "8"
 	}