internal/pkg: make tar temporary directory writable

This allows it to be renamed to work directory.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/tar.go

@@ -241,6 +241,10 @@ func (a *tarArtifact) Cure(c *CureContext) (err error) {
 		return
 	}
 
+	if err = os.Chmod(temp.String(), 0700); err != nil {
+		return
+	}
+
 	var entries []os.DirEntry
 	if entries, err = os.ReadDir(temp.String()); err != nil {
 		return