Add a new OpenAPI v3 REST API to warewulfd at /api

Co-authored-by: jason yang <jasonyangshadow@gmail.com>

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/image/config.go

@@ -31,3 +31,7 @@ func ImageParentDir() string {
 func ImageFile(name string) string {
 	return path.Join(ImageParentDir(), name+".img")
 }
+
+func CompressedImageFile(name string) string {
+	return ImageFile(name) + ".gz"
+}