hotfix: reduce size docker image file.

Dockerfile

@@ -1,17 +1,4 @@
-# Stage 1: Build custom Java runtime using jlink
-FROM eclipse-temurin:21 as jre-build
-
-# Create a custom Java runtime
-RUN $JAVA_HOME/bin/jlink \
-         --add-modules java.base \
-         --strip-debug \
-         --no-man-pages \
-         --no-header-files \
-         --compress=2 \
-         --output /javaruntime
-
-# Stage 2: Build the application
-FROM eclipse-temurin:21-jdk-alpine AS build
+FROM eclipse-temurin:21-jre-alpine AS build
 
 RUN apk add --no-cache maven
 
@@ -23,19 +10,13 @@ RUN mvn clean package -DskipTests -U \
     && rm -rf /root/.m2 \
     && rm -rf /app/src
 
-# Stage 3: Create the final image with the custom Java runtime and application
-FROM debian:buster-slim
-ENV JAVA_HOME=/opt/java/openjdk
-ENV PATH="${JAVA_HOME}/bin:${PATH}"
-COPY --from=jre-build /javaruntime $JAVA_HOME
+# Run stage
+FROM eclipse-temurin:21-jre-alpine
 
-# Copy the application JAR from the build stage
 WORKDIR /usr/src/app
 COPY --from=build /app/target/QualityLabPro-0.7.jar ./app.jar
 
-# Set environment variables
 ENV SPRING_PROFILES_ACTIVE=prod \
     SERVER_PORT=8080
 
-# Expose the application port
-EXPOSE ${SERVER_PORT}
+EXPOSE ${SERVER_PORT}