fix(sqltest): Restore SQLite helper functions for ncruces driver

The previous refactor accidentally removed the SQLite and CreateSQLiteDatabase
functions from sqltest/sqlite.go, breaking example tests. This restores the
functions while using the correct "sqlite3" driver name for ncruces/go-sqlite3.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: kyleconroy

internal/sqltest/sqlite.go

@@ -3,6 +3,56 @@
 package sqltest
 
 import (
+	"database/sql"
+	"os"
+	"path/filepath"
+	"testing"
+
 	_ "github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
+
+	"github.com/sqlc-dev/sqlc/internal/sql/sqlpath"
 )
+
+func SQLite(t *testing.T, migrations []string) (*sql.DB, func()) {
+	t.Helper()
+	// For each test, pick a new database name at random.
+	source, err := os.CreateTemp("", "sqltest_sqlite_")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := source.Close(); err != nil {
+		t.Fatal(err)
+	}
+	return CreateSQLiteDatabase(t, source.Name(), migrations)
+}
+
+func CreateSQLiteDatabase(t *testing.T, path string, migrations []string) (*sql.DB, func()) {
+	t.Helper()
+
+	t.Logf("open %s\n", path)
+	sdb, err := sql.Open("sqlite3", path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	files, err := sqlpath.Glob(migrations)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, f := range files {
+		blob, err := os.ReadFile(f)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if _, err := sdb.Exec(string(blob)); err != nil {
+			t.Fatalf("%s: %s", filepath.Base(f), err)
+		}
+	}
+
+	return sdb, func() {
+		if _, err := os.Stat(path); err == nil {
+			os.Remove(path)
+		}
+	}
+}