cmd/atlas/internal/docker: set client conn as ephemeral and limit its…

… lifetime

cmd/atlas/internal/docker/docker.go

@@ -586,6 +586,9 @@ func OpenWithOpts(ctx context.Context, u *url.URL, opts ...ConfigOption) (client
 	if client, err = sqlclient.Open(ctx, u1.String()); err != nil {
 		return nil, err
 	}
+	client.Ephemeral = true
+	client.DB.SetConnMaxLifetime(time.Minute)
+	client.DB.SetConnMaxIdleTime(time.Minute)
 	client.AddClosers(c)
 	return client, nil
 }

sql/sqlclient/client.go

@@ -42,6 +42,12 @@ type (
 		schemahcl.Marshaler
 		schemahcl.Evaluator
 
+		// Ephemeral indicates that the database we connect to is "ephemeral"
+		// (e.g., a temporary running container). This can be set by the driver
+		// that opens the client to signal to its consumers that there is no need
+		// to guard against race conditions with other Atlas clients.
+		Ephemeral bool
+
 		// Functions registered by the drivers and used for opening transactions and their clients.
 		openDriver func(schema.ExecQuerier) (migrate.Driver, error)
 		openTx     TxOpener