feat: Add Dockerfile for building and running the microservice

Author: RandithaK

Dockerfile

@@ -0,0 +1,34 @@
+# Dockerfile for admin-service
+
+# --- Build Stage ---
+# Use the official Maven image which contains the Java JDK
+FROM maven:3.8-eclipse-temurin-17 AS build
+
+# Set the working directory
+WORKDIR /app
+
+# Copy the pom.xml and download dependencies
+COPY admin-service/pom.xml .
+RUN mvn -B dependency:go-offline
+
+# Copy the rest of the source code and build the application
+# Note: We copy the pom.xml *first* to leverage Docker layer caching.
+COPY admin-service/src ./src
+RUN mvn -B clean package -DskipTests
+
+# --- Run Stage ---
+# Use a minimal JRE image for the final container
+FROM eclipse-temurin:17-jre-jammy
+
+# Set a working directory
+WORKDIR /app
+
+# Copy the built JAR from the 'build' stage
+# The wildcard is used in case the version number is in the JAR name
+COPY --from=build /app/target/*.jar app.jar
+
+# Expose the port your application runs on
+EXPOSE 8087
+
+# The command to run your application
+ENTRYPOINT ["java", "-jar", "app.jar"]