Change Dockerfile for ATB PTU5:

-> use bullseye and install python2.7

Dockerfile

@@ -21,7 +21,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-FROM debian:bullseye-slim as kas-base
+FROM debian:bullseye as kas-base
 
 ARG TARGETPLATFORM
 ARG DEBIAN_FRONTEND=noninteractive
@@ -34,7 +34,8 @@ RUN apt-get update && \
         python3-newt python3-colorlog \
         gosu lsb-release file vim less procps tree tar bzip2 zstd pigz lz4 unzip tmux libncurses-dev \
         git-lfs mercurial iproute2 ssh-client telnet curl rsync gnupg awscli sudo \
-        socat bash-completion && \
+        socat bash-completion \
+        python2.7 python-is-python2 && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*