Add flexibility to the path of the script

[yorugac]

Currently, k6-operator with ConfigMap and VolumeClaim options expects JS script to be present in /test folder:

k6-operator/pkg/types/types.go

Lines 22 to 57 in de57947

	func ParseScript(spec *v1alpha1.K6Spec) (*Script, error) {
	s := &Script{
	Filename: "test.js",
	Path: "/test/",
	}
	if spec.Script.VolumeClaim.Name != "" {
	s.Name = spec.Script.VolumeClaim.Name
	if spec.Script.VolumeClaim.File != "" {
	s.Filename = spec.Script.VolumeClaim.File
	}
	s.Type = "VolumeClaim"
	return s, nil
	}
	if spec.Script.ConfigMap.Name != "" {
	s.Name = spec.Script.ConfigMap.Name
	if spec.Script.ConfigMap.File != "" {
	s.Filename = spec.Script.ConfigMap.File
	}
	s.Type = "ConfigMap"
	return s, nil
	}
	if spec.Script.LocalFile != "" {
	s.Name = "LocalFile"
	s.Type = "LocalFile"
	s.Path, s.Filename = filepath.Split(spec.Script.LocalFile)
	return s, nil
	}
	return nil, errors.New("Script definition should contain one of: ConfigMap, VolumeClaim, LocalFile")
	}

These two options don't match how LocalFile is implemented and it also causes issues during usage.

Caveat: in order not to break anyone's existing setup, it'd be good to keep backwards-compatibility with the current approach.