Allow exec to run in its own container

lib/mrsk/cli/app.rb

@@ -41,11 +41,14 @@ class Mrsk::Cli::App < Mrsk::Cli::Base
   
   desc "exec [CMD]", "Execute a custom task on servers passed in as CMD='bin/rake some:task'"
   option :once, type: :boolean, default: false
+  option :run, type: :boolean, default: false
   def exec(cmd)
+    runner = options[:run] ? :run_exec : :exec
+
     if options[:once]
-      on(MRSK.config.primary_host) { puts capture(*MRSK.app.exec(cmd), verbosity: Logger::INFO) }
+      on(MRSK.config.primary_host) { puts capture(*MRSK.app.send(runner, cmd), verbosity: Logger::INFO) }
     else
-      on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.exec(cmd), verbosity: Logger::INFO) + "\n\n" }
+      on(MRSK.config.hosts) { |host| puts "App Host: #{host}\n" + capture(*MRSK.app.send(runner, cmd), verbosity: Logger::INFO) + "\n\n" }
     end
   end
 

lib/mrsk/commands/app.rb

@@ -40,6 +40,16 @@ class Mrsk::Commands::App < Mrsk::Commands::Base
       *command
   end
 
+  def run_exec(*command)
+    docker :run,
+      "-it",
+      "--rm",
+      *rails_master_key_arg,
+      *config.env_args,
+      config.absolute_image,
+      *command
+  end
+
   def console(host: config.primary_host)
     "ssh -t #{config.ssh_user}@#{host} '#{exec("bin/rails", "c", interactive: true).join(" ")}'"
   end

test/app_command_test.rb

@@ -15,4 +15,10 @@ class AppCommandTest < ActiveSupport::TestCase
     assert_equal \
       [:docker, :run, "-d", "--restart unless-stopped", "--name", "app-123", "-e", "RAILS_MASTER_KEY=456", "--label", "service=app", "--label", "role=web", "--label", "traefik.http.routers.app.rule='PathPrefix(`/`)'", "--label", "traefik.http.services.app.loadbalancer.healthcheck.path=/up", "--label", "traefik.http.services.app.loadbalancer.healthcheck.interval=1s", "--label", "traefik.http.middlewares.app.retry.attempts=3", "--label", "traefik.http.middlewares.app.retry.initialinterval=500ms", "dhh/app:123"], @app.run
   end
+
+  test "run with" do
+    assert_equal \
+      [ :docker, :run, "-it", "--rm", "-e", "RAILS_MASTER_KEY=456", "dhh/app:123", "bin/rails", "db:setup" ],
+      @app.run_exec("bin/rails", "db:setup")
+  end
 end