[add] added docker

docker-compose.yml

@@ -0,0 +1,32 @@
+version: '3.7'
+
+services:
+  ryndns:
+    build:
+      context: .
+      args:
+        USER_UID: ${UID_PROXY:-12001}
+        USER_GID: ${UID_PROXY:-12001}
+    environment:
+      # set to run app in subdirectory
+      RAILS_RELATIVE_URL_ROOT: /rynDNS
+      # set custom api key prefix
+      #API_KEY_PREFIX: zW3If4s5
+      # set custom header name for api key
+      #API_KEY_HEADER: X-API-Key
+      # set to reset the admin account
+      #RAILS_RESET_ADMIN: 1
+      # set app to run as demo
+      #RAILS_API_DEMO: 1
+      # set cycle to reset demo data
+      #RAILS_DEMO_RESET: 300
+    restart: always
+    image: ryndns
+    container_name: ryndns
+    ports:
+      - "3000:3000"
+    volumes:
+      - ryndns:/app/data
+
+volumes:
+  ryndns: