feat: use postgres

mail/internal/adapters/postgres/migrations/migrations.go

@@ -0,0 +1,19 @@
+// Package migrations exposes the embedded goose migration files used by Mail
+// Service to provision its `mail` schema in PostgreSQL.
+//
+// The embedded filesystem is consumed by `pkg/postgres.RunMigrations` during
+// mail-service startup and by `cmd/jetgen` when regenerating the
+// `internal/adapters/postgres/jet/` code against a transient PostgreSQL
+// instance.
+package migrations
+
+import "embed"
+
+//go:embed *.sql
+var fs embed.FS
+
+// FS returns the embedded filesystem containing every numbered goose
+// migration shipped with Mail Service.
+func FS() embed.FS {
+	return fs
+}