URL-4 Added Dockerfiles for all Services

services/shortener-service/Dockerfile

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+# Build stage
+FROM gradle:8.10.1-jdk21 AS build
+
+WORKDIR /app
+
+# Copy Gradle wrapper and build files for dependency caching
+COPY gradle/ gradle/
+COPY gradlew gradlew.bat ./
+COPY build.gradle settings.gradle ./
+
+# Copy source code
+COPY services/shortener-service/build.gradle ./services/shortener-service/
+COPY services/shortener-service/src ./services/shortener-service/src/
+
+# Build the application
+RUN chmod +x gradlew
+RUN ./gradlew :services:shortener-service:bootJar --no-daemon
+
+# Runtime stage
+FROM eclipse-temurin:21-jre-jammy AS runtime
+
+# Install curl for health checks (minimal size impact)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create non-root user
+RUN groupadd -r spring && useradd -r -g spring spring
+
+# Set working directory
+WORKDIR /app
+
+# Copy the JAR from build stage
+COPY --from=build /app/services/shortener-service/build/libs/*.jar app.jar
+
+# Change ownership to non-root user
+RUN chown spring:spring app.jar
+
+# Switch to non-root user
+USER spring:spring
+
+# Expose application port
+EXPOSE 8080
+
+# Health check for Kubernetes (can be overridden by K8s probes)
+HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
+  CMD curl -f http://localhost:8080/actuator/health || exit 1
+
+# Optimize JVM for containers
+ENV JAVA_OPTS="-XX:MaxRAMPercentage=75.0 -XX:+UseG1GC"
+
+# Run the application
+ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]
+