Added another Docker files as an example. These files are proposed in…

… PR #20. They include the generation of a PostgreSQL and Kong instance.

They are included as an example and not as "official" King's docker support because I consider that King`s docker should only include the King UI deploy.

examples/docker_king_with_kong/.dockerignore

@@ -0,0 +1,18 @@
+# ignore .git and .cache folders
+.git
+.cache
+
+# ignore all markdown files (md) beside all README*.md other than
+# README-secret.md
+*.md
+
+# ignore docs folders
+docs/
+
+# ignore Dockerfile and docker-compose files
+*Dockerfile*
+*docker-compose*
+
+# ignore node modules and logs
+node_modules/
+npm-debug.log

examples/docker_king_with_kong/Dockerfile

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+# King Build Image
+FROM node:19-alpine as dist
+
+WORKDIR /src
+
+COPY package*.json .
+
+RUN npm install
+
+COPY . .
+
+RUN npm run build-prod
+
+# King Nginx image
+FROM nginx:1.23.2-alpine as nginx
+
+COPY --from=dist /src/dist/king  /usr/share/nginx/html

examples/docker_king_with_kong/README.md

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+### Docker
+
+You can try King for Kong using [docker](https://docs.docker.com/get-docker/) and [docker-compose](https://docs.docker.com/compose/install/) with the next command.
+
+```
+docker-compose up -d
+```
+
+This will create a Kong Api Gateway container, a Postgresql container and finally a King for king container. After that King for Kong will be available at `http://localhost:8080` in production mode

examples/docker_king_with_kong/docker-compose.yaml

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+version: '3'
+
+services:
+  kong-database:
+    image: postgres:15.1-alpine
+    container_name: kong-database
+    environment:
+      - POSTGRES_USER=kong
+      - POSTGRES_DB=kong
+      - POSTGRES_PASSWORD=kong
+    volumes:
+      - "db-data-kong-postgres:/var/lib/postgresql/data"
+  kong-migrations:
+    image: kong:3.0.1-alpine
+    environment:
+      - KONG_DATABASE=postgres
+      - KONG_PG_HOST=kong-database
+      - KONG_PG_PASSWORD=kong
+    command: kong migrations bootstrap
+    restart: on-failure
+  kong:
+    image: kong:3.0.1-alpine
+    container_name: kong
+    environment:
+      - KONG_PG_HOST=kong-database
+      - KONG_PG_USER=kong
+      - KONG_PG_PASSWORD=kong
+      - KONG_PROXY_ACCESS_LOG=/dev/stdout
+      - KONG_ADMIN_ACCESS_LOG=/dev/stdout
+      - KONG_PROXY_ERROR_LOG=/dev/stderr
+      - KONG_ADMIN_ERROR_LOG=/dev/stderr
+      - KONG_PROXY_LISTEN=0.0.0.0:8000
+      - KONG_PROXY_LISTEN_SSL=0.0.0.0:8443
+      - KONG_ADMIN_LISTEN=0.0.0.0:8001
+      - KONG_CUSTOM_PLUGINS=kong-plugin-moesif
+    restart: on-failure
+    ports:
+      - 8000:8000
+      - 8443:8443
+      - 8001:8001
+  king:
+    build:
+      context: .
+    container_name: king
+    restart: on-failure
+    ports:
+      - 8080:80
+
+volumes:
+  db-data-kong-postgres: