Allow for fully native builds too

Skipping multiarch if there's a platform match between dev and prod.

lib/mrsk/commands/builder/native.rb

@@ -0,0 +1,19 @@
+require "mrsk/commands/base"
+
+class Mrsk::Commands::Builder::Native < Mrsk::Commands::Base
+  def create
+    # No op on native
+  end
+
+  def remove
+    # No op on native
+  end
+
+  def push
+    docker :build, "--push", "-t", config.absolute_image, "."
+  end
+
+  def pull
+    docker :pull, config.absolute_image
+  end
+end