driver(container): fix conditional statement for error handling

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

tests/create.go

@@ -0,0 +1,39 @@
+package tests
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/moby/buildkit/util/testutil/integration"
+	"github.com/stretchr/testify/require"
+)
+
+func createCmd(sb integration.Sandbox, opts ...cmdOpt) (string, error) {
+	opts = append([]cmdOpt{withArgs("create")}, opts...)
+	cmd := buildxCmd(sb, opts...)
+	out, err := cmd.CombinedOutput()
+	return string(out), err
+}
+
+var createTests = []func(t *testing.T, sb integration.Sandbox){
+	testCreateMemoryLimit,
+}
+
+func testCreateMemoryLimit(t *testing.T, sb integration.Sandbox) {
+	if sb.Name() != "docker-container" {
+		t.Skip("only testing for docker-container driver")
+	}
+
+	var builderName string
+	t.Cleanup(func() {
+		if builderName == "" {
+			return
+		}
+		out, err := rmCmd(sb, withArgs(builderName))
+		require.NoError(t, err, out)
+	})
+
+	out, err := createCmd(sb, withArgs("--driver", "docker-container", "--driver-opt", "network=host", "--driver-opt", "memory=1g"))
+	require.NoError(t, err, out)
+	builderName = strings.TrimSpace(out)
+}