Adding composer deps; Better PHPStan support

.gitignore

@@ -0,0 +1 @@
+tags

composer.json

@@ -5,6 +5,7 @@
      "require": {
          "php": ">=7.4",
          "amphp/amp" : "~v2.6.2",
+         "amphp/process" : "~v1.1.4",
          "phpseclib/phpseclib" : "~2.0.30"
      },
      "autoload": {

deploy.inc.php

@@ -1,6 +1,8 @@
 <?php
 namespace taskman;
+use Exception;
 use Amp;  
+use Amp\Process;  
 use phpseclib\Crypt\RSA;
 use phpseclib\Net\SSH2;
 use phpseclib\Net\SCP;
@@ -146,6 +148,7 @@ function deploy_node_host_exec($decl, $host, SSH2 $ssh, $cmd, &$status, $opts =
     return false;
   });
   $status = $ssh->getExitStatus();
+  // @phpstan-ignore-next-line
   if($res === false)
     throw new Exception("Fatal error executing($status): $cmd");
   if(($opts & DEPLOY_OPT_ERR_OK) == 0 && $status !== 0)