Add docker

.dockerignore

@@ -0,0 +1,27 @@
+/.bundle
+.byebug_history
+config/postal.yml
+config/smtp.cert
+config/smtp.key
+config/lets_encrypt.pem
+config/signing.key
+config/fast_server.cert
+config/fast_server.key
+public/assets
+vendor/bundle
+Procfile.local
+log/*
+storage/*
+tmp/*
+spec/*
+.git/*
+.github/*
+.vscode/*
+.yardoc/*
+doc/*
+Procfile*
+node_modules
+Dockerfile
+vendor/bundle
+.cache
+docker/*