fix of the fix

reth.Dockerfile

@@ -293,7 +293,9 @@ RUN --mount=type=cache,target=/usr/local/cargo/registry \
     fi
 
 # Final stage - minimal runtime
-FROM debian:trixie-slim AS runtime-common
+FROM debian:trixie-slim
+
+ARG BUILD_ALETHIA_RETH=false
 
 # Install runtime dependencies including jemalloc for better memory performance
 RUN apt-get update && apt-get install -y \
@@ -315,17 +317,15 @@ RUN useradd -m -u 1000 -s /bin/bash reth
 RUN mkdir -p /root/.local/share/reth && \
     chown -R reth:reth /root/.local/share
 
+# alethia-reth links jemalloc statically; preloading another jemalloc causes SIGSEGV
+RUN if [ "$BUILD_ALETHIA_RETH" != "true" ]; then \
+        echo '/usr/lib/x86_64-linux-gnu/libjemalloc.so.2' > /etc/ld.so.preload; \
+    fi
+
 ENV MALLOC_CONF="background_thread:true,metadata_thp:auto,dirty_decay_ms:30000,muzzy_decay_ms:30000"
 
 USER reth
 
 EXPOSE 30303 30303/udp 9001 8545 8546
 
-ENTRYPOINT ["/usr/local/bin/reth"]
-
-# Default: preload system jemalloc for binaries built without a bundled allocator
-FROM runtime-common AS runtime
-ENV LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2
-
-# alethia-reth links jemalloc statically; LD_PRELOAD causes SIGSEGV at startup
-FROM runtime-common AS runtime-alethia
+ENTRYPOINT ["/usr/local/bin/reth"]