Add spring backend

backend-spring/Dockerfile

@@ -0,0 +1,17 @@
+FROM eclipse-temurin:25-jdk-alpine AS build
+
+WORKDIR /app
+COPY gradle ./gradle
+COPY gradlew build.gradle.kts settings.gradle.kts ./
+RUN ./gradlew dependencies --no-daemon
+
+COPY src ./src
+RUN ./gradlew bootJar --no-daemon -x test
+
+FROM eclipse-temurin:25-jre-alpine
+
+WORKDIR /app
+COPY --from=build /app/build/libs/*.jar app.jar
+
+EXPOSE 8080
+CMD ["java", "-jar", "app.jar"]