dockerized the app

.env-sample

@@ -0,0 +1 @@
+NGROK_AUTHTOKEN=1g......foo...bar

README.md

@@ -35,5 +35,26 @@ To run on a specific port use `server.port` system property:
 java -Dserver.port=PORT_NUMBER -jar target/exkeymo-web-*-jar-with-dependencies.jar
 ```
 
+### Docker
+If you do not have Java installed, you can run the app with Docker Compose. 
+Use the `docker-compose` or `docker compose` command, depending on which one is installed:
+
+```bash
+docker compose up app
+
+```
+
+Next, browse to [http://localhost:6789](http://localhost:6789/) to access the application.
+
+If you want to get a public URL, obtain ngrok credentials, edit the `.env` file
+(`NGROK_AUTHTOKEN=…`), and run ngrok using the following command:
+
+```bash
+docker compose run --rm --interactive --service-ports ngrok
+
+```
+
+Ngrok will print the public tunnel, so you can simply browse to it!
+
 ### Use
 Visit [http://localhost/](http://localhost/). Documentation page [http://localhost/docs.html](http://localhost/docs.html).

docker-compose.yml

@@ -0,0 +1,24 @@
+version: '3'
+
+services:
+  ngrok:
+    depends_on: [app]
+    env_file: .env
+    image: ngrok/ngrok:alpine
+    command: http app:6789
+    ports:
+      - 127.0.0.1:4040:4040
+
+  app:
+    image: maven:3.9-amazoncorretto-17
+    command: sh -c "
+      set -x;
+      cd /app;
+      mvn clean install;
+      java -Dserver.port=6789 -jar target/exkeymo-web-*-jar-with-dependencies.jar
+      "
+    volumes:
+      - .:/app
+    ports:
+      - 127.0.0.1:6789:6789
+