add Dockerfile and configure production app

.dockerignore

@@ -0,0 +1,29 @@
+/db/*.sqlite3
+
+/node_modules
+/coverage
+/doc
+/.git
+/.github
+/.bundle
+/.yardoc
+
+/log/*
+/tmp/*
+!/log/.keep
+!/tmp/.keep
+
+/tmp/pids/*
+!/tmp/pids/.keep
+
+/storage/*
+!/storage/.keep
+
+.byebug_history
+
+/config/master.key
+/public/packs-test
+LICENSE
+/attachments
+/docuseal
+.DS_Store