fake server: add dependency to docker image

Author: spameier

Dockerfile

@@ -50,6 +50,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends python3 \
         libnotify-bin \
         # Runtime requirement for PyAV (pyrdp-convert to MP4)
         libavcodec58 libavdevice58 \
+        # Runtime requirement for fake server
+        python3-tk \
         && rm -rf /var/lib/apt/lists/*
 
 # Copy preinstalled dependencies from compile image