Add windows support (#548)

* update  build tags, ui support, and stereoscope, and release for windows support

Signed-off-by: Christopher Angelo Phillips <christopher.phillips@anchore.com>

syft/source/file_details.go

@@ -0,0 +1,21 @@
+//go:build linux || darwin
+// +build linux darwin
+
+package source
+
+import (
+	"os"
+	"syscall"
+)
+
+// GetXid is the UID GID system info for unix
+func GetXid(info os.FileInfo) (uid, gid int) {
+	uid = -1
+	gid = -1
+	if stat, ok := info.Sys().(*syscall.Stat_t); ok {
+		uid = int(stat.Uid)
+		gid = int(stat.Gid)
+	}
+
+	return uid, gid
+}

syft/source/file_details_win.go

@@ -0,0 +1,13 @@
+//go:build windows
+// +build windows
+
+package source
+
+import (
+	"os"
+)
+
+// GetXid is a placeholder for windows file information
+func GetXid(info os.FileInfo) (uid, gid int) {
+	return -1, -1
+}

syft/source/file_metadata.go

@@ -2,7 +2,6 @@ package source
 
 import (
 	"os"
-	"syscall"
 
 	"github.com/anchore/syft/internal/log"
 
@@ -39,12 +38,7 @@ func fileMetadataByLocation(img *image.Image, location Location) (FileMetadata,
 }
 
 func fileMetadataFromPath(path string, info os.FileInfo) FileMetadata {
-	uid := -1
-	gid := -1
-	if stat, ok := info.Sys().(*syscall.Stat_t); ok {
-		uid = int(stat.Uid)
-		gid = int(stat.Gid)
-	}
+	uid, gid := GetXid(info)
 
 	f, err := os.Open(path)
 	if err != nil {