add Dockerfile

Dockerfile

@@ -0,0 +1,14 @@
+# Use a base image with Java 17 installed
+FROM eclipse-temurin:17
+
+# 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"]