Add cataloger for Swift Package Manager. (#1919)

Signed-off-by: Tristan Farkas <Tristan.Farkas@axis.com>

syft/formats/common/spdxhelpers/source_info.go

@@ -54,6 +54,8 @@ func SourceInfo(p pkg.Package) string {
 		answer = "acquired package info from nix store path"
 	case pkg.Rpkg:
 		answer = "acquired package info from R-package DESCRIPTION file"
+	case pkg.SwiftPkg:
+		answer = "acquired package info from resolved Swift package manifest"
 	default:
 		answer = "acquired package info from the following paths"
 	}

syft/formats/common/spdxhelpers/source_info_test.go

@@ -231,6 +231,14 @@ func Test_SourceInfo(t *testing.T) {
 				"acquired package info from R-package DESCRIPTION file",
 			},
 		},
+		{
+			input: pkg.Package{
+				Type: pkg.SwiftPkg,
+			},
+			expected: []string{
+				"from resolved Swift package manifest",
+			},
+		},
 	}
 	var pkgTypes []pkg.Type
 	for _, test := range tests {