Commits on Sep 17, 2024

1. Upgrade commands for Kamal 1.x -> 2.0 …

   Adds:
   - `kamal upgrade` to upgrade all app hosts and accessory hosts
   - `kamal proxy upgrade` to upgrade the proxy on all hosts
   - `kamal accessory upgrade [name]` to upgrade accessories on all hosts
   
   Upgrade takes rolling and confirmed options and calls `proxy upgrade`
   and `accessory upgrade` in turn.
   
   To just upgrade a single host add -h [host] to the command. But the
   upgrade should run on all hosts, not just those running the proxy.
   
   Calling upgrade on a host that has already been upgraded should work ok.
   
   Upgrading hosts causes downtime but you can avoid if you run multiple
   hosts by:
   1. Implementing the pre-proxy-reboot and post-proxy-reboot hooks to
      remove the host from external load balancers
   2. Running the upgrade with the --rolling option
   
   **kamal proxy upgrade**
   1. Creates a `kamal` network if required
   2. Stops and removes the old proxy (whether Traefik or kamal-proxy)
   3. Starts a kamal-proxy container in the `kamal` network
   4. Reboots the app containers in the `kamal` network
   
   **kamal accessory upgrade [name]**
   1. Creates a `kamal` network if required
   2. Reboots the accessory containers in the `kamal` network
   
   A matching `downgrade` command will be added to Kamal 1.9.

   

   djmb committed Sep 17, 2024
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