Add --run flag to console command for running a specific command

--run CMD wraps the command in the shell: /bin/sh -c CMD, keeping TTY
mode so interactive commands like 'rails c' or 'bash' work correctly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/portainer_cli/commands/console.rb

@@ -22,10 +22,11 @@ module PortainerCli
       def run(args)
         opts = { shell: '/bin/sh' }
         OptionParser.new do |o|
-          o.on('--shell SHELL', 'Shell to use (default: /bin/sh)') { |v| opts[:shell] = v }
+          o.on('--shell SHELL', 'Shell to use (default: /bin/sh)')   { |v| opts[:shell] = v }
+          o.on('--run CMD',     'Run command instead of a bare shell') { |v| opts[:run] = v }
         end.parse!(args)
 
-        stack_name     = args.shift or error("Usage: portainer-cli console <stack> [container] [--shell /bin/bash]")
+        stack_name     = args.shift or error("Usage: portainer-cli console <stack> [container] [--run CMD] [--shell /bin/bash]")
         container_name = args.shift || stack_name
 
         stack       = resolve_stack(stack_name)
@@ -37,7 +38,7 @@ module PortainerCli
 
         $stderr.puts dim("Connecting to #{container_name} (#{container_id[0, 12]})...")
 
-        exec_id = create_exec(endpoint_id, container_id, opts[:shell])
+        exec_id = create_exec(endpoint_id, container_id, opts[:shell], opts[:run])
         ws_url  = exec_websocket_url(exec_id, endpoint_id)
 
         send_resize(endpoint_id, exec_id) if $stdout.tty?
@@ -123,7 +124,8 @@ module PortainerCli
         error("Container '#{name_or_id}' not found. Available:\n#{available}")
       end
 
-      def create_exec(endpoint_id, container_id, shell)
+      def create_exec(endpoint_id, container_id, shell, run_cmd = nil)
+        cmd = run_cmd ? [shell, '-c', run_cmd] : [shell]
         result = @client.post(
           "/api/endpoints/#{endpoint_id}/docker/containers/#{container_id}/exec",
           {
@@ -131,7 +133,7 @@ module PortainerCli
             'AttachStdout' => true,
             'AttachStderr' => true,
             'Tty'          => true,
-            'Cmd'          => [shell]
+            'Cmd'          => cmd
           }
         )
         result['Id']