feat: add sync files\folders

src/main.rs

@@ -2,6 +2,7 @@ mod cli;
 mod config;
 mod local;
 mod ssh;
+mod sync;
 
 use std::process::ExitCode;
 
@@ -93,10 +94,10 @@ fn run(cli: &cli::Cli) -> Result<()> {
             session = Some(ssh::connect(&resolved)?);
         }
 
-        if !project.sync.is_empty() {
-            println!("stage 4 not implemented yet: SFTP file transfer");
-        }
         if let Some(session) = session.as_mut() {
+            for rule in &project.sync {
+                sync::upload(session, &rule.source, &rule.target.to_string_lossy())?;
+            }
             for cmd in remote_cmds {
                 session.exec(cmd)?;
             }