Add link for hexdump correctly

... in Dockerfile, see #2586

Author: drwetter

Dockerfile

@@ -19,7 +19,6 @@ RUN source /etc/os-release \
   && rpm -e util-linux --nodeps \
   && zypper "${ZYPPER_OPTIONS[@]}" --non-interactive install --download-in-advance --no-recommends \
        bash procps grep gawk sed coreutils busybox ldns libidn2-0 socat openssl curl \
-  && ln -s /usr/bin/busybox /usr/bin/hexdump \
   && zypper up -y \
   && zypper "${ZYPPER_OPTIONS[@]}" clean --all
 ## Cleanup (reclaim approx 13 MiB):
@@ -36,6 +35,7 @@ ARG INSTALL_ROOT
 COPY --link --from=builder ${INSTALL_ROOT} /
 # Link busybox to tar, see #2403. Create user + (home with SGID set):
 RUN  ln -s /usr/bin/busybox /usr/bin/tar \
+  && ln -s /usr/bin/busybox /usr/bin/hexdump \
   && echo 'testssl:x:1000:1000::/home/testssl:/bin/bash' >> /etc/passwd \
   && echo 'testssl:x:1000:' >> /etc/group \
   && echo 'testssl:!::0:::::' >> /etc/shadow \