updates the docker image (#1432)

the new image uses the base image's compiler

Author: ivg

docker/debian/testing/Dockerfile

@@ -1,19 +1,11 @@
-FROM ocaml/opam2:debian-testing
+FROM ocaml/opam:debian
 
 WORKDIR /home/opam
 
-RUN sudo apt-get update --yes && sudo apt-get install wget --yes \
- && wget https://radare.mikelloc.com/get/4.5.0-git/radare2_4.5.0-git_amd64.deb \
- && sudo dpkg -i radare2_4.5.0-git_amd64.deb \
- && opam switch 4.09 \
- && eval "$(opam env)" \
- && opam remote set-url default https://opam.ocaml.org \
- && opam repo add bap git://github.com/BinaryAnalysisPlatform/opam-repository#testing --all \
+RUN opam remote set-url default https://opam.ocaml.org \
+ && opam repo add  bap-testing git+https://github.com/BinaryAnalysisPlatform/opam-repository#testing --all \
  && opam update \
  && opam depext --install bap --yes -j 1 \
- && opam clean -acrs \
- && rm -rf /home/opam/.opam/4.0[2-8,10] \
- && rm -rf /home/opam/.opam/4.09/.opam-switch/sources/* \
- && rm -rf /home/opam/opam-repository
+ && opam clean -acrs
 
 ENTRYPOINT ["opam", "config", "exec", "--"]