feat: update Docker runtime to eclipse-temurin:23-jdk-alpine

Replace amazoncorretto:23-al2023-jdk with eclipse-temurin:23-jdk-alpine
to address 14 security vulnerabilities. The Alpine-based image provides
a smaller attack surface while maintaining JDK 23 compatibility.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jpicklyk

Dockerfile

@@ -23,7 +23,7 @@ COPY src src
 RUN ./gradlew build --no-daemon
 
 # Runtime stage
-FROM amazoncorretto:23-al2023-jdk
+FROM eclipse-temurin:23-jdk-alpine
 
 WORKDIR /app