add Dockerfile

backend/Dockerfile

@@ -0,0 +1,32 @@
+# Use a base image with Java 17
+FROM openjdk:17-jdk-slim AS build
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy Gradle wrapper and configuration files
+COPY gradlew .
+COPY gradle/ gradle/
+COPY build.gradle .
+COPY settings.gradle .
+
+# Copy the source code
+COPY src/ src/
+
+# Make Gradle wrapper executable and build the application
+RUN ./gradlew build
+
+# Use a smaller runtime image for the final build
+FROM openjdk:17-jdk-slim
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the built application from the build stage
+COPY --from=build /app/build/libs/*.jar app.jar
+
+# Expose port 8080
+EXPOSE 8080
+
+# Run the application
+ENTRYPOINT ["java", "-jar", "app.jar"]