message: op-chain-ops: improve error message
  Improves the error message when reading a deploy config
  to print the path. Will be helpful for CLI tooling that consumes
  this function to give a better error message at runtime.
diff: @@ -3,6 +3,7 @@ package genesis
  import (
  "encoding/json"
  "errors"
  + "fmt"
  "math/big"
  "os"
  "path/filepath"
  @@ -84,7 +85,7 @@ type DeployConfig struct {
  func NewDeployConfig(path string) (*DeployConfig, error) {
  file, err := os.ReadFile(path)
  if err != nil {
  - return nil, err
  + return nil, fmt.Errorf("deploy config at %s not found: %w", path, err)
  }
  var config DeployConfig
  