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.rb

@@ -32,6 +32,7 @@ module PortainerCli
         portainer-cli create container --endpoint ID --image IMAGE [--name NAME] [--port h:c] [--env K=V]
         portainer-cli console <stack> [container]                Open interactive shell (resolves endpoint automatically)
           --shell SHELL                                          Shell to use (default: /bin/sh)
+          --run CMD                                              Run command instead of a bare shell
         portainer-cli exec <endpoint-id> <container>            Open interactive shell (manual endpoint)
           --shell SHELL                                          Shell to use (default: /bin/sh)