ensure up-to-date libdeflate is used

Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get -qq update && \
 ADD https://github.com/ebiggers/libdeflate/archive/v1.18.tar.gz /tmp
 RUN tar xzf /tmp/v1.18.tar.gz -C /tmp
 WORKDIR /tmp/libdeflate-1.18
-RUN cmake -B build && cmake --build build -j$(nproc) && cmake --install build
+RUN cmake -B build && cmake --build build -j$(nproc) && cmake --install build && cp /usr/local/lib/libdeflate.so.0 /lib/x86_64-linux-gnu/libdeflate.so.0
 
 ADD . /src
 WORKDIR /src
@@ -20,6 +20,9 @@ RUN ctest -V
 FROM ubuntu:20.04
 RUN apt-get -qq update && \
      apt-get -qq install -y --no-install-recommends --no-install-suggests \
-     tabix bcftools less
+     bcftools less
 COPY --from=builder /src/spvcf /usr/local/bin/spvcf
+COPY --from=builder /src/external/src/htslib/bgzip /usr/local/bin/bgzip
+COPY --from=builder /src/external/src/htslib/tabix /usr/local/bin/tabix
+COPY --from=builder /usr/local/lib/libdeflate.so.0 /lib/x86_64-linux-gnu/libdeflate.so.0
 CMD ["spvcf"]