try change image building to buildah

backend/Dockerfile.native

@@ -1,5 +1,5 @@
 # ---- Pull Maven from its official image (avoids microdnf under QEMU) ----
-FROM maven:3.9.9-eclipse-temurin-21 AS maven-dist
+FROM docker.io/library/maven:3.9.9-eclipse-temurin-21 AS maven-dist
 
 # ---- Build stage: GraalVM 25 + Maven ----
 ARG TARGETPLATFORM=linux/arm64
@@ -20,7 +20,7 @@ COPY src ./src
 RUN mvn -Pnative package -DskipTests
 
 # ---- Runtime stage: minimal ARM64 distroless ----
-FROM --platform=$TARGETPLATFORM gcr.io/distroless/base-nossl-debian12
+FROM --platform=$TARGETPLATFORM gcr.io/distroless/base-debian12
 COPY --from=build /app/target/ai-teacher-backend /app/ai-teacher-backend
 EXPOSE 8080
 ENTRYPOINT ["/app/ai-teacher-backend"]