[feat] Dockerfile updated to add maven build

Author: Ramachandran Nellaiyappan

Dockerfile

@@ -1,3 +1,10 @@
+# Maven Build
+FROM maven:3-eclipse-temurin-21-alpine AS builder
+COPY pom.xml /app/
+COPY src /app/src
+RUN --mount=type=cache,target=/root/.m2 mvn -f /app/pom.xml clean package -DskipTests
+
+# Run jar file with appropriate veriables
 FROM eclipse-temurin:21
 EXPOSE 8080
 COPY target/*.jar journey-api.jar