fix for bullseye

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:buster
+FROM debian:bullseye
 
 LABEL Maintainer="Wolfgang Hottgenroth <woho@hottis.de>"
 LABEL ImageName="registry.hottis.de/dockerized/base-build-env"
@@ -12,12 +12,13 @@ RUN \
   apt-get install -y make && \
   apt-get install -y openssh-client && \
   apt-get install -y git && \
-  apt-get install -y python && \
-  apt-get install -y python-requests && \
-  apt-get install -y python-pycodestyle && \
-  apt-get install -y python-yaml && \
-  apt-get install -y python-pip && \
-  apt-get install -y python-xmltodict && \
+  apt-get install -y python3 && \
+  update-alternatives --install /usr/bin/python python /usr/bin/python3.9 1 && \
+  apt-get install -y python3-requests && \
+  apt-get install -y python3-pycodestyle && \
+  apt-get install -y python3-yaml && \
+  apt-get install -y python3-pip && \
+  apt-get install -y python3-xmltodict && \
   apt-get install -y gpg && \
   apt-get install -y apt-transport-https && \
   apt-get install -y wget && \

readme.md

@@ -1,6 +1,6 @@
 ## Base image for build containers
 
-Based on Debian Buster
+Based on Debian ~~Buster~~ Bullseye
 
 Contains additionally:
    * make
@@ -12,5 +12,9 @@ Contains additionally:
    * wget and curl
    * zip, unzip and 7z
    * vim.tiny
+   * ps
+   * doxygen
    * GitLab release tool: https://home.hottis.de/gitlab/wolutator/gitlabreleaseuploader including validator for semantic version according to https://semver.org/
 
+Switched to Python 3
+