DONE: pipeline cicd for backend

be/Dockerfile

@@ -1,3 +1,26 @@
-FROM openjdk:17-jdk-alpine
-COPY target/bbqms-0.0.1-SNAPSHOT.jar ./app.jar
-ENTRYPOINT ["java", "-jar", "/app.jar"]
+# Build stage
+FROM maven:3.9-eclipse-temurin-17-alpine AS build
+WORKDIR /app
+
+COPY pom.xml .
+COPY mvnw .
+COPY .mvn .mvn
+COPY src ./src
+
+RUN ./mvnw -q -DskipTests package
+
+# Runtime stage
+FROM eclipse-temurin:17-jre-alpine
+WORKDIR /app
+
+RUN addgroup -S qms && adduser -S qms -G qms \
+    && mkdir -p /app/uploads/ads \
+    && chown -R qms:qms /app
+
+COPY --from=build /app/target/bbqms-0.0.1-SNAPSHOT.jar app.jar
+
+USER qms
+
+EXPOSE 8080
+
+ENTRYPOINT ["java", "-jar", "app.jar"]