Refactor micropub specific things out to a slice

slices/micropub/commands/workouts/create.rb

@@ -0,0 +1,18 @@
+require "securerandom"
+require "dry/monads"
+require "filemagic"
+
+module Adamantium
+  module Commands
+    module Workouts
+      class Create < Command
+        include Deps["repos.workout_repo"]
+        include Dry::Monads[:result]
+
+        def call(svg:, distance:, duration:)
+          workout_repo.create(path: svg, distance: distance, duration: duration, published_at: Time.now)
+        end
+      end
+    end
+  end
+end