image: Add microshift preset to pull container image

As part of a9c0b4c we didn't add microshift preset. This PR add
microshift preset to fetch default container image when it is available
to `quay.io`.

pkg/crc/constants/constants.go

@@ -234,6 +234,8 @@ func getImageName(preset crcpreset.Preset) string {
 		return "podman-bundle"
 	case crcpreset.OKD:
 		return "okd-bundle"
+	case crcpreset.Microshift:
+		return "microshift-bundle"
 	default:
 		return "openshift-bundle"
 	}

pkg/crc/image/image.go

@@ -104,6 +104,8 @@ func getPresetNameE(imageName string) (crcpreset.Preset, error) {
 		return crcpreset.OKD, nil
 	case "podman-bundle":
 		return crcpreset.Podman, nil
+	case "microshift-bundle":
+		return crcpreset.Microshift, nil
 	default:
 		return crcpreset.OpenShift, fmt.Errorf("invalid image name '%s' (Should be openshift-bundle, okd-bundle or podman-bundle)", imageName)
 	}