add docker and docker compose

Dockerfile

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+# Use a base image with Java 17 installed
+FROM eclipse-temurin:21
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy the JAR file into the container
+COPY target/twelve-factor-demo.jar my-app.jar
+
+# Expose the port your application listens on (if applicable)
+EXPOSE 8080
+
+# Set the command to run your application when the container starts
+CMD ["java", "-jar", "my-app.jar"]

docker-compose.yml

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+version: '3'
+services:
+  12-factor-demo:
+    image: intesys/twelve-factor-app-kotlin:latest
+    environment:
+      - SERVER_PORT=8080
+      - CUSTOM_MESSAGE=Hello World From Docker
+    ports:
+      - 8085:8080