Add option for remote building of single-arch

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

@@ -0,0 +1,71 @@
+require "mrsk/commands/builder/native"
+
+class Mrsk::Commands::Builder::Native::Remote < Mrsk::Commands::Builder::Native
+  def create
+    combine \
+      create_context,
+      create_buildx
+  end
+
+  def remove
+    combine \
+      remove_context,
+      remove_buildx
+  end
+
+  def push
+    docker :buildx, :build,
+      "--push",
+      "--platform", platform,
+      "-t", config.absolute_image,
+      *build_args,
+      *build_secrets,
+      "."
+  end
+
+  def info
+    combine \
+      docker(:context, :ls),
+      docker(:buildx, :ls)
+  end
+
+
+  private
+    def arch
+      config.builder["remote"]["arch"]
+    end
+
+    def host
+      config.builder["remote"]["host"]
+    end
+
+    def builder_name
+      "mrsk-#{config.service}"
+    end
+
+    def builder_name_with_arch
+      "#{builder_name}-#{arch}"
+    end
+
+    def platform
+      "linux/#{arch}"
+    end
+
+    def create_context
+      docker :context, :create,
+        builder_name_with_arch, "--description", "'#{builder_name} #{arch} native host'", "--docker", "'host=#{host}'"
+    end
+
+    def remove_context
+      docker :context, :rm, builder_name_with_arch
+    end
+
+    def create_buildx
+      docker :buildx, :create,
+        "--use", "--name", builder_name, builder_name_with_arch, "--platform", platform
+    end
+
+    def remove_buildx
+      docker :buildx, :rm, builder_name
+    end
+end