added py3status (including i3status)

Dockerfile

@@ -9,6 +9,11 @@ RUN apt-get update \
         xserver-xorg-core \
         xserver-xorg-input-evdev \
     && rm --recursive /var/lib/apt/lists/
+# TODO merge
+RUN apt-get update \
+    && apt-get install --no-install-recommends --yes py3status
+RUN setcap -r /usr/bin/i3status
+RUN sed --in-place 's/status_command i3status/status_command py3status/' /etc/i3/config*
 
 #RUN useradd --create-home nonroot \
 #    && apt-get update \