Add local/remote builder combo for multiarch

lib/mrsk/commands/builder.rb

@@ -5,6 +5,10 @@ class Mrsk::Commands::Builder < Mrsk::Commands::Base
     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
@@ -12,4 +16,22 @@ class Mrsk::Commands::Builder < Mrsk::Commands::Base
   def pull
     docker :pull, config.absolute_image
   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
+
+
+  def create_with_context(arch)
+    docker :buildx, :create, "--use", "--name", "mrsk", "mrsk-#{arch}"
+  end
+
+  def append_context(arch)
+    docker :buildx, :create, "--append", "--name", "mrsk", "mrsk-#{arch}"
+  end
 end

lib/mrsk/configuration.rb

@@ -3,7 +3,7 @@ require "active_support/core_ext/string/inquiry"
 require "erb"
 
 class Mrsk::Configuration
-  delegate :service, :image, :servers, :env, :labels, :registry, to: :config, allow_nil: true
+  delegate :service, :image, :servers, :env, :labels, :registry, :builder, to: :config, allow_nil: true
 
   class << self
     def load_file(file)

lib/tasks/mrsk/build.rake

@@ -23,5 +23,71 @@ namespace :mrsk do
     task :pull do
       on(MRSK.config.hosts) { execute *MRSK.builder.pull }
     end
+
+    desc "Create a local buildx setup to produce multi-arch images"
+    task :create do
+      run_locally do
+        execute *MRSK.builder.create
+      end
+    end
+
+    desc "Remove local buildx setup"
+    task :remove do
+      run_locally do
+        execute *MRSK.builder.remove
+      end
+    end
+
+    namespace :remote do
+      desc "Create local and remote buildx setup for fully native multi-arch builds"
+      task create: %w[ create:context create:buildx ]
+
+      namespace :create do
+        task :context do
+          if MRSK.config.builder && 
+              (local = MRSK.config.builder["local"]) &&
+              (remote = MRSK.config.builder["remote"])
+            run_locally do
+              execute *MRSK.builder.create_context(local["arch"], local["host"])
+              execute *MRSK.builder.create_context(remote["arch"], remote["host"])
+            end
+          else
+            error "Missing configuration of builder:local/remote in config"
+          end
+        end
+
+        task :buildx do
+          if MRSK.config.builder && 
+              (local = MRSK.config.builder["local"]) &&
+              (remote = MRSK.config.builder["remote"])
+            run_locally do
+              execute *MRSK.builder.create_with_context(local["arch"])
+              execute *MRSK.builder.append_context(remote["arch"])
+            end
+          else
+            error "Missing configuration of builder:local/remote in config"
+          end
+        end
+      end
+
+
+      desc "Remove local and remote buildx setup"
+      task remove: %w[ remove:context mrsk:build:remove ]
+
+      namespace :remove do
+        task :context do
+          if MRSK.config.builder && 
+              (local = MRSK.config.builder["local"]) &&
+              (remote = MRSK.config.builder["remote"])
+            run_locally do
+              execute *MRSK.builder.remove_context(local["arch"])
+              execute *MRSK.builder.remove_context(remote["arch"])
+            end
+          else
+            error "Missing configuration of builder:local/remote in config"
+          end
+        end
+      end
+    end
   end
 end