Fix Dockerfile: Update Docker images and file permissions for HF Spaces deployment - No code logic changes

Dockerfile

@@ -1,6 +1,6 @@
 # Multi-stage build for da-autodelete microservice
 # Build stage
-FROM eclipse-temurin:21-jdk AS build
+FROM openjdk:21-jdk-slim AS build
 
 # Set working directory
 WORKDIR /app
@@ -12,8 +12,10 @@ COPY build.gradle.kts .
 COPY settings.gradle.kts .
 COPY gradle.properties .
 
-# Make gradlew executable
-RUN chmod +x gradlew
+# Fix file permissions for Linux container (Windows files lose permissions)
+RUN chmod +x gradlew && \
+    chmod +x gradle/wrapper/gradle-wrapper.jar && \
+    chmod +x gradle/wrapper/gradle-wrapper.properties
 
 # Download dependencies
 RUN ./gradlew dependencies --no-daemon
@@ -25,7 +27,7 @@ COPY src src
 RUN ./gradlew build -x test --no-daemon
 
 # Runtime stage
-FROM eclipse-temurin:21-jre
+FROM openjdk:21-slim
 
 # Install curl for health checks
 RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
@@ -37,7 +39,9 @@ WORKDIR /app
 COPY --from=build /app/build/libs/*.jar app.jar
 
 # HF Spaces requires running as user with UID 1000
-RUN useradd -m -u 1000 -s /bin/bash appuser
+RUN useradd -m -u 1000 -s /bin/bash appuser && \
+    chown -R appuser:appuser /app
+
 USER appuser
 
 # Expose the service port (HF Spaces will map this to the configured app_port)