feat: Add ent-based sqlite3 storage

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

storage/ent/sqlite_test.go

@@ -0,0 +1,31 @@
+package ent
+
+import (
+	"os"
+	"testing"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/dexidp/dex/storage"
+	"github.com/dexidp/dex/storage/conformance"
+)
+
+func newStorage() storage.Storage {
+	logger := &logrus.Logger{
+		Out:       os.Stderr,
+		Formatter: &logrus.TextFormatter{DisableColors: true},
+		Level:     logrus.DebugLevel,
+	}
+
+	cfg := SQLite3{File: ":memory:"}
+	s, err := cfg.Open(logger)
+	if err != nil {
+		panic(err)
+	}
+	return s
+}
+
+func TestSQLite3(t *testing.T) {
+	conformance.RunTests(t, newStorage)
+	conformance.RunTransactionTests(t, newStorage)
+}