feat: Add io.Reader-based API to archive cmd

pkg/config/config.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"io"
+	"io/fs"
 	"os"
 
 	"github.com/pojntfx/stfs/internal/persisters"
@@ -53,3 +54,10 @@ type CryptoConfig struct {
 type PasswordConfig struct {
 	Password string
 }
+
+type FileConfig struct {
+	GetFile func() (io.ReadSeekCloser, error)
+	Info    fs.FileInfo
+	Path    string
+	Link    string
+}