update java docker file to two stage build

Author: GREENRAT-K405

Dockerfile

@@ -0,0 +1,17 @@
+#build stage
+FROM maven:3.9-eclipse-temurin-17-alpine AS builder
+WORKDIR /build
+COPY pom.xml .
+RUN mvn dependency:go-offline -B
+COPY src ./src
+RUN mvn clean package -DskipTests
+
+#runtime stage
+FROM eclipse-temurin:17-jdk-alpine
+
+WORKDIR /app
+
+# Copy the JAR from the build stage
+COPY --from=builder /build/target/concore-*.jar /app/concore.jar
+EXPOSE 3000
+CMD ["java", "-jar", "/app/concore.jar"]