Recommended refactors

- make sure spec sets new cache dir
- move clean out of api
- capture warewulfconf.Paths.Cachedir+"/warewulf" in once place
- split Clean() into multiple functions
- remove WriteFileAbs

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

internal/pkg/container/imprt.go

@@ -16,7 +16,7 @@ import (
 )
 
 func ImportDocker(uri string, name string, sCtx *types.SystemContext) error {
-	OciBlobCacheDir := path.Join(warewulfconf.Get().Paths.Cachedir + "/warewulf")
+	OciBlobCacheDir := warewulfconf.Get().Paths.OciBlobCachedir()
 
 	err := os.MkdirAll(OciBlobCacheDir, 0755)
 	if err != nil {