added Dockerfile

Dockerfile

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+FROM python:3.8
+# based on debian
+
+RUN apt update \
+    && apt upgrade -y \
+    && apt install -y \
+        libcairo2-dev \
+        ffmpeg \
+        texlive \
+        texlive-latex-extra \
+        texlive-fonts-extra \
+        texlive-latex-recommended \
+        texlive-science \
+        tipa
+
+
+# choose one of the following installation types:
+
+##
+## Option 1:
+## Simple installation
+##
+#RUN pip3 install manimce
+
+##
+## Option 2:
+## git clone installation
+##
+#RUN git clone https://github.com/ManimCommunity/manim.git \
+#   && cd manim \
+#   && python3 -m pip install .
+#WORKDIR /manim
+
+##
+## Option 3:
+## copy local git folder
+##
+#COPY . /manim
+#RUN cd /manim \
+#    && python3 -m pip install .
+#WORKDIR /manim
+
+##
+## Option 4:
+## only install manim dependencies
+##   and later, mount (using -v) your git folder
+##
+RUN pip3 install Pillow progressbar grpcio-tools grpcio pydub watchdog tqdm rich numpy pygments scipy colour pycairo
+## the same ugly patch, only here there's no need to uninstall
+RUN pip3 install --no-binary :all: -U cairocffi --no-cache
+RUN pip3 install --no-binary :all: -U pangocffi --no-cache
+RUN pip3 install --no-binary :all: -U pangocairocffi --no-cache
+## /manim doesn't exist yet in this option. You have to mount it using `docker run -v /your/path/to/manim:/manim`
+WORKDIR /manim
+
+
+
+## an ugly fix, as of 2020/10/31
+## based on:
+## https://www.reddit.com/r/manim/comments/jfvcya/weekly_help_thread_ask_for_manim_help_here/
+## which linked to:
+## https://github.com/leifgehrmann/pangocairocffi/pull/13#issuecomment-714570325
+##
+## fix only if using one of the first three options
+#RUN python3 -m pip uninstall -y pangocairocffi cairocffi pangocffi
+#RUN pip3 install --no-binary :all: -U cairocffi --no-cache
+#RUN pip3 install --no-binary :all: -U pangocffi --no-cache
+#RUN pip3 install --no-binary :all: -U pangocairocffi --no-cache
+
+
+ENTRYPOINT ["/bin/bash", "-c"]
+CMD ["/bin/bash"]
+
+
+# build with:
+# docker build --label="manimce" --tag="manimce" .
+
+# test option 1 with:
+# docker run --rm -it manimce "apt install -y wget && wget 'https://raw.githubusercontent.com/ManimCommunity/manim/master/example_scenes/basic.py' && python -m manim basic.py SquareToCircle --low_quality -s && echo yay || echo nay"
+
+# test the other options with:
+# docker run --rm -it manimce "python -m manim example_scenes/basic.py SquareToCircle --low_quality -s > /dev/null 2>&1 && echo yay || echo nay"