Add Rubocop

- Pull in the 37signals house style
- Autofix violations
- Add to CI

lib/kamal/configuration/accessory.rb

@@ -16,7 +16,7 @@ class Kamal::Configuration::Accessory
   end
 
   def hosts
-    if (specifics.keys & ["host", "hosts", "roles"]).size != 1
+    if (specifics.keys & [ "host", "hosts", "roles" ]).size != 1
       raise ArgumentError, "Specify one of `host`, `hosts` or `roles` for accessory `#{name}`"
     end
 
@@ -159,7 +159,7 @@ class Kamal::Configuration::Accessory
       if specifics.key?("host")
         host = specifics["host"]
         if host
-          [host]
+          [ host ]
         else
           raise ArgumentError, "Missing host for accessory `#{name}`"
         end

lib/kamal/configuration/boot.rb

@@ -8,7 +8,7 @@ class Kamal::Configuration::Boot
     limit = @options["limit"]
 
     if limit.to_s.end_with?("%")
-      [@host_count * limit.to_i / 100, 1].max
+      [ @host_count * limit.to_i / 100, 1 ].max
     else
       limit
     end

lib/kamal/configuration/builder.rb

@@ -88,7 +88,7 @@ class Kamal::Configuration::Builder
   private
     def valid?
       if @options["cache"] && @options["cache"]["type"]
-        raise ArgumentError, "Invalid cache type: #{@options["cache"]["type"]}" unless ["gha", "registry"].include?(@options["cache"]["type"])
+        raise ArgumentError, "Invalid cache type: #{@options["cache"]["type"]}" unless [ "gha", "registry" ].include?(@options["cache"]["type"])
       end
     end
 
@@ -109,7 +109,7 @@ class Kamal::Configuration::Builder
     end
 
     def cache_to_config_for_gha
-      [ "type=gha", @options["cache"]&.fetch("options", nil)].compact.join(",")
+      [ "type=gha", @options["cache"]&.fetch("options", nil) ].compact.join(",")
     end
 
     def cache_to_config_for_registry

lib/kamal/configuration/role.rb

@@ -67,7 +67,7 @@ class Kamal::Configuration::Role
   end
 
   def host_env_file_path
-    File.join host_env_directory, "#{[config.service, name, config.destination].compact.join("-")}.env"
+    File.join host_env_directory, "#{[ config.service, name, config.destination ].compact.join("-")}.env"
   end
 
   def env_args
@@ -123,13 +123,13 @@ class Kamal::Configuration::Role
   end
 
   def cord_host_directory
-    File.join config.run_directory_as_docker_volume, "cords", [container_prefix, config.run_id].join("-")
+    File.join config.run_directory_as_docker_volume, "cords", [ container_prefix, config.run_id ].join("-")
   end
 
   def cord_volume
     if (cord = health_check_options["cord"])
       @cord_volume ||= Kamal::Configuration::Volume.new \
-        host_path: File.join(config.run_directory, "cords", [container_prefix, config.run_id].join("-")),
+        host_path: File.join(config.run_directory, "cords", [ container_prefix, config.run_id ].join("-")),
         container_path: cord
     end
   end
@@ -229,7 +229,7 @@ class Kamal::Configuration::Role
 
     def specializations
       if config.servers.is_a?(Array) || config.servers[name].is_a?(Array)
-        { }
+        {}
       else
         config.servers[name].except("hosts")
       end