feat: add traefik classifier (#1504)

Signed-off-by: witchcraze <witchcraze@gmail.com>

syft/pkg/cataloger/binary/cataloger_test.go

@@ -19,6 +19,34 @@ func TestClassifierCataloger_DefaultClassifiers_PositiveCases(t *testing.T) {
 		fixtureDir string
 		expected   pkg.Package
 	}{
+		{
+			name:       "positive-traefik-2.9.6",
+			fixtureDir: "test-fixtures/classifiers/positive/traefik-2.9.6",
+			expected: pkg.Package{
+				Name:      "traefik",
+				Version:   "2.9.6",
+				Type:      "binary",
+				PURL:      "pkg:generic/traefik@2.9.6",
+				Locations: singleLocation("traefik"),
+				Metadata: pkg.BinaryMetadata{
+					Classifier: "traefik-binary",
+				},
+			},
+		},
+		{
+			name:       "positive-traefik-1.7.34",
+			fixtureDir: "test-fixtures/classifiers/positive/traefik-1.7.34",
+			expected: pkg.Package{
+				Name:      "traefik",
+				Version:   "1.7.34",
+				Type:      "binary",
+				PURL:      "pkg:generic/traefik@1.7.34",
+				Locations: singleLocation("traefik"),
+				Metadata: pkg.BinaryMetadata{
+					Classifier: "traefik-binary",
+				},
+			},
+		},
 		{
 			name:       "positive-memcached-1.6.18",
 			fixtureDir: "test-fixtures/classifiers/positive/memcached-1.6.18",

syft/pkg/cataloger/binary/default_classifiers.go

@@ -165,4 +165,14 @@ var defaultClassifiers = []classifier{
 		Package: "memcached",
 		PURL:    mustPURL("pkg:generic/memcached@version"),
 	},
+	{
+		Class:    "traefik-binary",
+		FileGlob: "**/traefik",
+		EvidenceMatcher: fileContentsVersionMatcher(
+			// [NUL]v1.7.34[NUL]
+			// [NUL]2.9.6[NUL]
+			`(?m)\x00v?(?P<version>[0-9]+\.[0-9]+\.[0-9]+(-alpha[0-9]|-beta[0-9]|-rc[0-9])?)\x00`),
+		Package: "traefik",
+		PURL:    mustPURL("pkg:generic/traefik@version"),
+	},
 }