Only install libquadmath on linux/amd64 platform

deploy/Dockerfile.bartenderhaddock3

@@ -48,7 +48,7 @@ RUN pip install .
 
 # haddock3 ============================================================================================================
 WORKDIR /opt/haddock3
-RUN echo cachebust=9 && git clone --depth 1 -b ${HADDOCK3_VERSION} https://github.com/${HADDOCK3_GHORG}/haddock3.git .
+RUN echo cachebust=10 && git clone --depth 1 -b ${HADDOCK3_VERSION} https://github.com/${HADDOCK3_GHORG}/haddock3.git .
 RUN pip install .
 # For restraints web service
 RUN pip install fastapi uvicorn
@@ -58,11 +58,13 @@ WORKDIR /
 
 FROM python:3.9-slim-bookworm
 
-# cns is linked against libquadmath0, so install it
-RUN apt-get update && \
-  apt-get install -y libquadmath0 \
-  &&  \
-  apt-get clean && rm -rf /var/lib/apt/lists/*
+# cns executable installed by haddock3 is linked against libquadmath on linux/amd64
+ARG TARGETPLATFORM
+RUN if [ "$TARGETPLATFORM" = "linux/amd64" ]; then \
+    apt-get update && \
+    apt-get install -y libquadmath0 \
+    &&  \
+    apt-get clean && rm -rf /var/lib/apt/lists/*;fi
 
 COPY --from=builder /wait /wait
 COPY --from=builder /venv /venv