Add docker compose that builds rather then from gh

Author: MotorTruck1221

docker/docker-compose-build.yml

@@ -0,0 +1,10 @@
+version: "3"
+services:
+  ruby:
+    image: ruby:latest
+    build: .
+    container_name: ruby
+    restart: unless-stopped
+    ports:
+      # DO NOT CHANGE 8080!
+      - your port here:8080