Fuzzing: Add 3 fuzzers

Signed-off-by: AdamKorcz <adam@adalogics.com>

configuration/fuzz.go

@@ -0,0 +1,11 @@
+package configuration
+
+import (
+	"bytes"
+)
+
+func ParserFuzzer(data []byte) int {
+	rd := bytes.NewReader(data)
+	_, _ = Parse(rd)
+	return 1
+}

reference/fuzz.go

@@ -0,0 +1,6 @@
+package reference
+
+func FuzzParseNormalizedNamed(data []byte) int {
+	_, _ = ParseNormalizedNamed(string(data))
+	return 1
+}

registry/api/v2/fuzz.go

@@ -0,0 +1,6 @@
+package v2
+
+func FuzzParseForwardedHeader(data []byte) int {
+	_, _, _ = parseForwardedHeader(string(data))
+	return 1
+}

script/oss_fuzz_build.sh

@@ -0,0 +1,5 @@
+#!/bin/bash -eu
+
+compile_go_fuzzer github.com/distribution/distribution/v3/configuration ParserFuzzer parser_fuzzer
+compile_go_fuzzer github.com/distribution/distribution/v3/reference FuzzParseNormalizedNamed fuzz_parsed_normalized_named
+compile_go_fuzzer github.com/distribution/distribution/v3/registry/api/v2 FuzzParseForwardedHeader fuzz_parse_forwarded_header