Use a shared prune

lib/tasks/mrsk/images.rake

@@ -1,10 +0,0 @@
-require_relative "setup"
-
-namespace :mrsk do
-  namespace :images do
-    desc "Prune unused images older than 30 days"
-    task :prune do
-      on(MRSK_CONFIG.servers) { execute "docker image prune -f --filter 'until=720h'" }
-    end
-  end
-end

lib/tasks/mrsk/prune.rake

@@ -0,0 +1,18 @@
+require_relative "setup"
+
+namespace :mrsk do
+  desc "Prune unused images and stopped containers"
+  task prune: [ "prune:images", "prune:containers" ]
+
+  namespace :prune do
+    desc "Prune unused images older than 30 days"
+    task :images do
+      on(MRSK_CONFIG.servers) { execute "docker image prune -f --filter 'until=720h'" }
+    end
+
+    desc "Prune stopped containers for the service older than 3 days"
+    task :containers do
+      on(MRSK_CONFIG.servers) { execute "docker container prune -f --filter label=service=#{MRSK_CONFIG.service} --filter 'until=72h'" }
+    end
+  end
+end