Initial commit: proyecto ContabilidadSaPolar completo

Dockerfile.backend

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+FROM maven:3.9-eclipse-temurin-21-alpine AS builder
+WORKDIR /app
+COPY pom.xml .
+COPY backend/pom.xml backend/pom.xml
+RUN mvn dependency:go-offline -B -pl backend -am
+COPY backend/ backend/
+RUN mvn package -B -pl backend -DskipTests
+RUN java -Djarmode=layertools -jar backend/target/*.jar extract --destination extracted
+
+FROM eclipse-temurin:21-jre-alpine
+WORKDIR /app
+RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+
+COPY --from=builder /app/extracted/dependencies/ ./
+COPY --from=builder /app/extracted/spring-boot-loader/ ./
+COPY --from=builder /app/extracted/snapshot-dependencies/ ./
+COPY --from=builder /app/extracted/application/ ./
+
+RUN mkdir -p /app/uploads && chown -R appuser:appgroup /app
+
+USER appuser
+EXPOSE 8080
+ENTRYPOINT ["java", "org.springframework.boot.loader.launch.JarLauncher"]