Update .gitignore to allow ent/schema/ directory

Schema files are source code and should be committed.
Only generated files in ent/ should be ignored.

ent/schema/user.go

@@ -0,0 +1,18 @@
+package schema
+
+import "entgo.io/ent"
+
+// User holds the schema definition for the User entity.
+type User struct {
+	ent.Schema
+}
+
+// Fields of the User.
+func (User) Fields() []ent.Field {
+	return nil
+}
+
+// Edges of the User.
+func (User) Edges() []ent.Edge {
+	return nil
+}