kragen-flask-server docker image size is large

[jay-m-dev]

Describe the bug
When building the kragen-flask-server docker image, the size of the image is 9.35GB.

To Reproduce
Steps to reproduce the behavior:

1. At the step in the instructions to run ./kragen-gui.sh, the script runs and builds the kragen-flask-server docker image
2. The docker image seems to run correctly, but the size is 9.35GB.
3. docker history shows that the graph_of_thoughts layer is 8.78GB in size:

> IMAGE          CREATED          CREATED BY                                      SIZE      COMMENT
> 1426e8c6dc8b   39 minutes ago   CMD ["python" "execgpt.py"]                     0B        buildkit.dockerfile.v0
> <missing>      39 minutes ago   EXPOSE map[5050/tcp:{}]                         0B        buildkit.dockerfile.v0
> <missing>      39 minutes ago   RUN /bin/sh -c flask --app ExecGPTServer ini…   817kB     buildkit.dockerfile.v0
> <missing>      39 minutes ago   RUN /bin/sh -c pip install -e graph_of_thoug…   8.78GB    buildkit.dockerfile.v0
> <missing>      52 minutes ago   RUN /bin/sh -c pip install -r ./ExecGPTServe…   87.3MB    buildkit.dockerfile.v0
> <missing>      53 minutes ago   RUN /bin/sh -c apt update --fix-missing     …   342MB     buildkit.dockerfile.v0
> <missing>      53 minutes ago   COPY . /app # buildkit                          297kB     buildkit.dockerfile.v0
> <missing>      53 minutes ago   WORKDIR /app                                    0B        buildkit.dockerfile.v0
> <missing>      2 weeks ago      CMD ["python3"]                                 0B        buildkit.dockerfile.v0
> <missing>      2 weeks ago      RUN /bin/sh -c set -eux;   savedAptMark="$(a…   12.2MB    buildkit.dockerfile.v0
> <missing>      2 weeks ago      ENV PYTHON_GET_PIP_SHA256=dfe9fd5c28dc98b5ac…   0B        buildkit.dockerfile.v0
> <missing>      2 weeks ago      ENV PYTHON_GET_PIP_URL=https://github.com/py…   0B        buildkit.dockerfile.v0
> <missing>      2 weeks ago      ENV PYTHON_SETUPTOOLS_VERSION=65.5.1            0B        buildkit.dockerfile.v0
> <missing>      2 weeks ago      ENV PYTHON_PIP_VERSION=23.0.1                   0B        buildkit.dockerfile.v0
> <missing>      2 weeks ago      RUN /bin/sh -c set -eux;  for src in idle3 p…   32B       buildkit.dockerfile.v0
> <missing>      2 weeks ago      RUN /bin/sh -c set -eux;   savedAptMark="$(a…   31.9MB    buildkit.dockerfile.v0
> <missing>      2 weeks ago      ENV PYTHON_VERSION=3.10.14                      0B        buildkit.dockerfile.v0
> <missing>      2 weeks ago      ENV GPG_KEY=A035C8C19219BA821ECEA86B64E628F8…   0B        buildkit.dockerfile.v0
> <missing>      2 weeks ago      RUN /bin/sh -c set -eux;  apt-get update;  a…   9.23MB    buildkit.dockerfile.v0
> <missing>      2 weeks ago      ENV LANG=C.UTF-8                                0B        buildkit.dockerfile.v0
> <missing>      2 weeks ago      ENV PATH=/usr/local/bin:/usr/local/sbin:/usr…   0B        buildkit.dockerfile.v0
> <missing>      25 hours ago     /bin/sh -c #(nop)  CMD ["bash"]                 0B
> <missing>      25 hours ago     /bin/sh -c #(nop) ADD file:d4bb05cb4d403a78b…   74.8MB

Expected behavior
The image size should be of a reasonable size, 2 other users have reported that the image size on their systems (Ubuntu and Mac) are about 2GB in size.

Desktop (please complete the following information):

• OS: Arch Linux (release 2024.04.01) and WSL2 running Ubuntu 22.04.4 LTS

Additional context
Although the image and container appear to be functional, this may be an issue for other users. So, this issue may need further investigation (perhaps on different platforms)