Add support for detecting nested java archives (#77)

* with sb build app

* test nested jar support

* pin jdk version during parse test (but dont compare version)

internal/file/zip_file_manifest.go

@@ -0,0 +1,58 @@
+package file
+
+import (
+	"archive/zip"
+	"fmt"
+	"os"
+	"sort"
+
+	"github.com/anchore/imgbom/internal"
+
+	"github.com/anchore/imgbom/internal/log"
+)
+
+type ZipFileManifest map[string]os.FileInfo
+
+func newZipManifest() ZipFileManifest {
+	return make(ZipFileManifest)
+}
+
+func (z ZipFileManifest) Add(entry string, info os.FileInfo) {
+	z[entry] = info
+}
+
+func (z ZipFileManifest) GlobMatch(patterns ...string) []string {
+	uniqueMatches := internal.NewStringSet()
+
+	for _, pattern := range patterns {
+		for entry := range z {
+			if GlobMatch(pattern, entry) {
+				uniqueMatches.Add(entry)
+			}
+		}
+	}
+
+	results := uniqueMatches.ToSlice()
+	sort.Strings(results)
+
+	return results
+}
+
+func NewZipFileManifest(archivePath string) (ZipFileManifest, error) {
+	zipReader, err := zip.OpenReader(archivePath)
+	manifest := newZipManifest()
+	if err != nil {
+		return manifest, fmt.Errorf("unable to open zip archive (%s): %w", archivePath, err)
+	}
+	defer func() {
+		err = zipReader.Close()
+		if err != nil {
+			log.Errorf("unable to close zip archive (%s): %w", archivePath, err)
+		}
+	}()
+
+	for _, file := range zipReader.Reader.File {
+		manifest.Add(file.Name, file.FileInfo())
+	}
+	return manifest, nil
+}