luks: implements support for Alpine

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

convert_options.go

@@ -26,6 +26,8 @@ type convertOptions struct {
 
 	splitBoot bool
 	bootSize  uint64
+
+	luksPassword string
 }
 
 func WithSize(size uint64) ConvertOption {
@@ -75,3 +77,9 @@ func WithBootSize(bootSize uint64) ConvertOption {
 		o.bootSize = bootSize
 	}
 }
+
+func WithLuksPassword(password string) ConvertOption {
+	return func(o *convertOptions) {
+		o.luksPassword = password
+	}
+}