include image labels in cycloneDX SBOM (#2294)

* include image labels in SBOM

Signed-off-by: Benji Visser <benji@093b.org>

* update tests

Signed-off-by: Benji Visser <benji@093b.org>

* gocritic

Signed-off-by: Benji Visser <benji@093b.org>

* add properties

Signed-off-by: Benji Visser <benji@093b.org>

* add decoder

Signed-off-by: Benji Visser <benji@093b.org>

* update golden snapshots

Signed-off-by: Benji Visser <benji@093b.org>

* decodeProperties

Signed-off-by: Benji Visser <benji@093b.org>

* add test

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* remove the snapshot test changes

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* restore snapshots

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

---------

Signed-off-by: Benji Visser <benji@093b.org>
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
Co-authored-by: Alex Goodman <wagoodman@users.noreply.github.com>

syft/source/stereoscope_image_metadata.go

@@ -18,6 +18,7 @@ type StereoscopeImageSourceMetadata struct {
 	Architecture   string                     `json:"architecture"`
 	Variant        string                     `json:"architectureVariant,omitempty"`
 	OS             string                     `json:"os"`
+	Labels         map[string]string          `json:"labels,omitempty"`
 }
 
 // StereoscopeLayerMetadata represents all static metadata that defines what a container image layer is.
@@ -48,6 +49,7 @@ func NewStereoscopeImageMetadata(img *image.Image, userInput string) Stereoscope
 		Architecture:   img.Metadata.Architecture,
 		Variant:        img.Metadata.Variant,
 		OS:             img.Metadata.OS,
+		Labels:         img.Metadata.Config.Config.Labels,
 	}
 
 	// populate image metadata

syft/source/stereoscope_image_source.go

@@ -192,6 +192,7 @@ func imageMetadataFromStereoscopeImage(img *image.Image, reference string) Stere
 		Architecture:   img.Metadata.Architecture,
 		Variant:        img.Metadata.Variant,
 		OS:             img.Metadata.OS,
+		Labels:         img.Metadata.Config.Config.Labels,
 	}
 }