Allow for fully native builds too

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

lib/mrsk/commands/builder/multiarch.rb

@@ -0,0 +1,19 @@
+require "mrsk/commands/base"
+
+class Mrsk::Commands::Builder::Multiarch < Mrsk::Commands::Base
+  def create
+    docker :buildx, :create, "--use", "--name", "mrsk"
+  end
+
+  def remove
+    docker :buildx, :rm, "mrsk"
+  end
+
+  def push
+    docker :buildx, :build, "--push", "--platform linux/amd64,linux/arm64", "-t", config.absolute_image, "."
+  end
+
+  def pull
+    docker :pull, config.absolute_image
+  end
+end

lib/mrsk/commands/builder/multiarch/remote.rb

@@ -0,0 +1,19 @@
+require "mrsk/commands/builder/multiarch"
+
+class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Multiarch
+  def create(arch)
+    super + [ "mrsk-#{arch}", "--platform", "linux/#{arch}" ]
+  end
+
+  def append(arch)
+    docker :buildx, :create, "--append", "--name", "mrsk", "mrsk-#{arch}", "--platform", "linux/#{arch}"
+  end
+
+  def create_context(arch, host)
+    docker :context, :create, "mrsk-#{arch}", "--description", "'MRSK #{arch} Native Host'", "--docker", "'host=#{host}'"
+  end
+
+  def remove_context(arch)
+    docker :context, :rm, "mrsk-#{arch}"
+  end
+end

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