KAMAL_HOST env var mop-up

- Ensure tests pass
- Switch from -e to --env everywhere
- Check KAMAL_HOST env var in integration tests

lib/kamal/commands/accessory.rb

@@ -17,10 +17,10 @@ class Kamal::Commands::Accessory < Kamal::Commands::Base
       "--name", service_name,
       "--detach",
       "--restart", "unless-stopped",
-      *([ "-e", "KAMAL_HOST=\"#{host}\"" ] if host),
       *network_args,
       *config.logging_args,
       *publish_args,
+      *([ "--env", "KAMAL_HOST=\"#{host}\"" ] if host),
       *env_args,
       *volume_args,
       *label_args,

lib/kamal/commands/app.rb

@@ -20,9 +20,9 @@ class Kamal::Commands::App < Kamal::Commands::Base
       "--name", container_name,
       "--network", "kamal",
       *([ "--hostname", hostname ] if hostname),
-      "-e", "KAMAL_CONTAINER_NAME=\"#{container_name}\"",
-      "-e", "KAMAL_VERSION=\"#{config.version}\"",
-      "-e", "KAMAL_HOST=\"#{host}\"",
+      "--env", "KAMAL_CONTAINER_NAME=\"#{container_name}\"",
+      "--env", "KAMAL_VERSION=\"#{config.version}\"",
+      "--env", "KAMAL_HOST=\"#{host}\"",
       *role.env_args(host),
       *role.logging_args,
       *config.volume_args,