[Dev] fix Dockerfiles (use stable debian:buster) and add 19.1

devel_tools/docker/frama-c.18.0/Dockerfile

+FROM debian:buster as base
+
+# Install non-OCaml dependencies + opam
+RUN apt-get update && apt-get install -y \
+    cvc4 \
+    opam \
+    z3 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN opam init --disable-sandboxing --compiler=ocaml-base-compiler.4.05.0 -y
+
+# "RUN eval $(opam env)" does not work, so we manually set its variables
+ENV OPAM_SWITCH_PREFIX "/root/.opam/ocaml-base-compiler.4.05.0"
+ENV CAML_LD_LIBRARY_PATH "/root/.opam/ocaml-base-compiler.4.05.0/lib/stublibs:/root/.opam/ocaml-base-compiler.4.05.0/lib/ocaml/stublibs:/root/.opam/ocaml-base-compiler.4.05.0/lib/ocaml"
+ENV OCAML_TOPLEVEL_PATH "/root/.opam/ocaml-base-compiler.4.05.0/lib/toplevel"
+ENV MANPATH "$MANPATH:/root/.opam/ocaml-base-compiler.4.05.0/man"
+ENV PATH "/root/.opam/ocaml-base-compiler.4.05.0/bin:$PATH"
+
+RUN opam update -y && opam install depext -y
+
+# Install packages from reference configuration
+RUN apt-get update && opam update -y && opam depext --install -y --verbose \
+    alt-ergo.1.30 \
+    apron.20160125 \
+    conf-graphviz.0.1 \
+    mlgmpidl.1.2.7 \
+    ocamlfind.1.8.0 \
+    ocamlgraph.1.8.8 \
+    why3.0.88.3 \
+    yojson.1.4.1 \
+    zarith.1.7 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN why3 config --detect-provers
+
+# with_source: keep Frama-C sources
+ARG with_source=no
+
+RUN cd /root && \
+    wget http://frama-c.com/download/frama-c-18.0-Argon.tar.gz && \
+    tar xvf frama-c-*.tar.gz && \
+    (cd frama-c-* && \
+        ./configure --disable-gui && \
+        make -j && \
+        make install \
+    ) && \
+    rm -f frama-c-*.tar.gz && \
+    [ "${with_source}" != "no" ] || rm -rf frama-c-*
+
+# with_test: run Frama-C tests; requires "with_source=yes"
+ARG with_test=no
+
+RUN if [ "${with_test}" != "no" ]; then \
+       apt-get update && \
+       opam update -y && opam depext --install -y \
+           conf-python-3.1.0.0 \
+           conf-time.1 \
+           --verbose \
+        && \
+        rm -rf /var/lib/apt/lists/* && \
+        cd /root/frama-c-* && \
+        make tests; \
+    fi

devel_tools/docker/frama-c.19.1/Dockerfile

+FROM debian:buster as base
+
+# Install non-OCaml dependencies + opam
+RUN apt-get update && apt-get install -y \
+    cvc4 \
+    opam \
+    z3 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN opam init --disable-sandboxing --compiler=ocaml-base-compiler.4.05.0 -y
+
+# "RUN eval $(opam env)" does not work, so we manually set its variables
+ENV OPAM_SWITCH_PREFIX "/root/.opam/ocaml-base-compiler.4.05.0"
+ENV CAML_LD_LIBRARY_PATH "/root/.opam/ocaml-base-compiler.4.05.0/lib/stublibs:/root/.opam/ocaml-base-compiler.4.05.0/lib/ocaml/stublibs:/root/.opam/ocaml-base-compiler.4.05.0/lib/ocaml"
+ENV OCAML_TOPLEVEL_PATH "/root/.opam/ocaml-base-compiler.4.05.0/lib/toplevel"
+ENV MANPATH "$MANPATH:/root/.opam/ocaml-base-compiler.4.05.0/man"
+ENV PATH "/root/.opam/ocaml-base-compiler.4.05.0/bin:$PATH"
+
+RUN opam update -y && opam install depext -y
+
+# Install packages from reference configuration
+RUN apt-get update && opam update -y && opam depext --install -y --verbose \
+    alt-ergo-free.2.0.0 \
+    apron.20160125 \
+    conf-graphviz.0.1 \
+    mlgmpidl.1.2.9 \
+    ocamlfind.1.8.0 \
+    ocamlgraph.1.8.8 \
+    why3.1.2.0 \
+    yojson.1.4.1 \
+    zarith.1.7 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN why3 config --detect-provers
+
+# with_source: keep Frama-C sources
+ARG with_source=no
+
+RUN cd /root && \
+    wget http://frama-c.com/download/frama-c-19.1-Potassium.tar.gz && \
+    tar xvf frama-c-*.tar.gz && \
+    (cd frama-c-* && \
+        ./configure --disable-gui && \
+        make -j && \
+        make install \
+    ) && \
+    rm -f frama-c-*.tar.gz && \
+    [ "${with_source}" != "no" ] || rm -rf frama-c-*
+
+# with_test: run Frama-C tests; requires "with_source=yes"
+ARG with_test=no
+
+RUN if [ "${with_test}" != "no" ]; then \
+       apt-get update && \
+       opam update -y && opam depext --install -y \
+           conf-python-3.1.0.0 \
+           conf-time.1 \
+           --verbose \
+        && \
+        rm -rf /var/lib/apt/lists/* && \
+        cd /root/frama-c-* && \
+        make tests; \
+    fi

devel_tools/docker/frama-c.20.0/Dockerfile

-FROM debian:sid as base
+FROM debian:buster as base
 
 # Install non-OCaml dependencies + opam
 RUN apt-get update && apt-get install -y \
@@ -58,7 +58,6 @@ RUN if [ "${with_test}" != "no" ]; then \
            conf-time.1 \
            --verbose \
         && \
-        apt-get install python -y && \
         rm -rf /var/lib/apt/lists/* && \
         cd /root/frama-c-* && \
         make tests; \

devel_tools/docker/frama-c.21.0/Dockerfile

-FROM debian:sid as base
+FROM debian:buster as base
 
 # Install non-OCaml dependencies + opam
 RUN apt-get update && apt-get install -y \

devel_tools/docker/frama-c.21.1/Dockerfile

-FROM debian:sid as base
+FROM debian:buster as base
 
 # Install non-OCaml dependencies + opam
 RUN apt-get update && apt-get install -y \