Refactor Dockerfile for security and SonarQube quality standards.

Dockerfile to align with best practices for security and SonarQube quality standards.

Dockerfile

@@ -1,9 +1,18 @@
+# Use a lightweight base image with OpenJDK 8
 FROM openjdk:8u151-jdk-alpine3.7
 
+# Set a non-root user for running the application
+RUN adduser -D imagebuilder
+USER imagebuilder
+
+# Expose the port on which the application will run
 EXPOSE 8070
 
+# Copy the JAR file to the /usr/app directory
 COPY target/shopping-cart*.jar /usr/app/
 
+# Set the working directory to /usr/app
 WORKDIR /usr/app
 
-CMD java -jar shopping-cart*.jar
+# Run the application using a non-root user
+CMD ["java", "-jar", "shopping-cart*.jar"]