fix building mock_trainer

mock_trainer.dockerfile

@@ -18,15 +18,11 @@ WORKDIR /app/
 RUN python3 -m pip install --upgrade pip
 
 # Install system packages required by Pillow
+# TODO upgrade to pillow >=10 in pyproject.toml
 RUN apt-get update && \
     apt-get install -y \
-    libjpeg62-turbo-dev \
-    zlib1g-dev \
-    libfreetype6-dev \
-    liblcms2-dev \
-    libopenjpeg-dev \
-    libtiff5-dev \
-    libwebp-dev 
+    libjpeg-dev\
+    && rm -rf /var/lib/apt/lists/*
 
 RUN python3 -m pip install --no-cache-dir "uvicorn[standard]"  tqdm async_generator aiofiles retry debugpy pytest-asyncio psutil icecream pytest "pytest-mock==3.6.1" autopep8 pynvml 
 RUN python3 -m pip install --no-cache-dir "learning-loop-node==0.7.53rc2"