Misc fixes, templates

src/Container/ContainerManager.php

@@ -251,6 +251,10 @@ class ContainerManager
 
         $cmdl = 'docker '.join(' ',array_map('escapeshellarg', $args));
 
+        $cmdl = preg_replace_callback('<\$\{(.+?)\}>', function ($v) use ($service) {
+            return $service['environment'][$v[1]]??null;
+        }, $cmdl);
+
         echo "$ {$cmdl}\n";
         passthru($cmdl);