Added demo docker build

demo/Dockerfile

@@ -0,0 +1,38 @@
+# First stage: JDK build
+FROM openjdk:17 AS build
+
+# Update package lists and Install Maven
+RUN microdnf update -y && \
+    microdnf install -y maven && \
+    microdnf clean all
+
+WORKDIR /usr/src/app
+
+# Copy the Maven dependencies.
+COPY pom.xml .
+RUN mvn dependency:go-offline
+
+# Copy the application source code
+COPY src/ ./src/
+COPY frontend/ ./frontend/
+
+## Do the build
+RUN mvn clean install -Pproduction
+
+# Second stage: Lightweight jdk-slim image
+FROM openjdk:17-jdk-slim
+RUN useradd -m appuser
+
+RUN mkdir /app && \
+    chown -R appuser /app
+
+USER appuser
+
+WORKDIR /app
+
+# Copy the native binary from the build stage
+COPY --from=build /usr/src/app/target/*.jar /app/app.jar
+
+# Run the application
+EXPOSE 8080
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]