Added support for multistage build cache

lib/mrsk/commands/builder/base.rb

@@ -13,11 +13,11 @@ class Mrsk::Commands::Builder::Base < Mrsk::Commands::Base
   end
 
   def build_options
-    [ *build_tags, *build_labels, *build_args, *build_secrets, *build_dockerfile ]
+    [ *build_tags, *build_cache, *build_labels, *build_args, *build_secrets, *build_dockerfile ]
   end
 
   def build_context
-    context
+    config.builder.context
   end
 
 
@@ -26,39 +26,30 @@ class Mrsk::Commands::Builder::Base < Mrsk::Commands::Base
       [ "-t", config.absolute_image, "-t", config.latest_image ]
     end
 
+    def build_cache
+      if config.builder.cache?
+        ["--cache-to", config.builder.cache_to,
+          "--cache-from", config.builder.cache_from]
+      end
+    end
+
     def build_labels
       argumentize "--label", { service: config.service }
     end
 
     def build_args
-      argumentize "--build-arg", args, sensitive: true
+      argumentize "--build-arg", config.builder.args, sensitive: true
     end
 
     def build_secrets
-      argumentize "--secret", secrets.collect { |secret| [ "id", secret ] }
+      argumentize "--secret", config.builder.secrets.collect { |secret| [ "id", secret ] }
     end
 
     def build_dockerfile
-      if Pathname.new(File.expand_path(dockerfile)).exist?
-        argumentize "--file", dockerfile
+      if Pathname.new(File.expand_path(config.builder.dockerfile)).exist?
+        argumentize "--file", config.builder.dockerfile
       else
-        raise BuilderError, "Missing #{dockerfile}"
+        raise BuilderError, "Missing #{config.builder.dockerfile}"
       end
     end
-
-    def args
-      (config.builder && config.builder["args"]) || {}
-    end
-
-    def secrets
-      (config.builder && config.builder["secrets"]) || []
-    end
-
-    def dockerfile
-      (config.builder && config.builder["dockerfile"]) || "Dockerfile"
-    end
-
-    def context
-      (config.builder && config.builder["context"]) || "."
-    end
 end