dockerfile improvements for smaller image

Dockerfile

@@ -2,8 +2,17 @@
 FROM python:3.11.3-slim AS build
 
 ENV DEBIAN_FRONTEND=noninteractive
-
-RUN apt update -y && apt install -y git
+# Build dummy packages to skip installing them and their dependencies -- Copied from FlareSolverr
+RUN apt update -y && apt install -y git \
+    && apt-get install -y --no-install-recommends equivs \
+    && equivs-control libgl1-mesa-dri \
+    && printf 'Section: misc\nPriority: optional\nStandards-Version: 3.9.2\nPackage: libgl1-mesa-dri\nVersion: 99.0.0\nDescription: Dummy package for libgl1-mesa-dri\n' >> libgl1-mesa-dri \
+    && equivs-build libgl1-mesa-dri \
+    && mv libgl1-mesa-dri_*.deb /libgl1-mesa-dri.deb \
+    && equivs-control adwaita-icon-theme \
+    && printf 'Section: misc\nPriority: optional\nStandards-Version: 3.9.2\nPackage: adwaita-icon-theme\nVersion: 99.0.0\nDescription: Dummy package for adwaita-icon-theme\n' >> adwaita-icon-theme \
+    && equivs-build adwaita-icon-theme \
+    && mv adwaita-icon-theme_*.deb /adwaita-icon-theme.deb
 
 RUN python3 -m venv /venv
 ENV PATH=/venv/bin:$PATH
@@ -19,7 +28,11 @@ ENV DEBIAN_FRONTEND=noninteractive
 
 WORKDIR /opt/SassBot
 
-RUN apt update -y && apt install -y --no-install-recommends chromium xvfb
+RUN apt update -y && apt install -y --no-install-recommends chromium xvfb \
+    # Remove temporary files and hardware decoding libraries -- Copied from FlareSolverr
+    && rm -rf /var/lib/apt/lists/* \
+    && rm -f /usr/lib/x86_64-linux-gnu/libmfxhw* \
+    && rm -f /usr/lib/x86_64-linux-gnu/mfx/* 
 
 COPY --from=build /venv /venv
 ENV PATH=/venv/bin:$PATH