Add docker stuff

docker/docker-compose.yml

@@ -0,0 +1,23 @@
+version: '3.8'
+
+services:
+  bang-web-server:
+    build:
+      context: ../ # point to the parent directory where package.json and source code reside
+      dockerfile: docker/Dockerfile # specific path to the Dockerfile
+    container_name: bang
+    domainname: bang.gbrown.org
+    hostname: bang
+    networks:
+      - node_apps
+    ports:
+      - "5000:5000"
+    tty: true
+    restart: unless-stopped
+    volumes:
+      - ../:/app # mount the parent directory to /app in the container
+    command: serve -s /app -l 5000
+
+networks:
+  node_apps:
+    external: true