move workdir from dockerfile to docker-compose.yml

Dockerfile

@@ -11,5 +11,4 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/*
 COPY requirements.txt requirements.txt
 RUN python3 -m pip install -r requirements.txt && rm requirements.txt
-WORKDIR /opt/manim
 ENTRYPOINT ["python", "-m", "manim"]

docker-compose.yml

@@ -8,3 +8,4 @@ services:
       - ${MANIM_PATH:?MANIM_PATH environment variable isn't set}:/opt/manim
     environment:
       - PYTHONPATH=/opt/manim
+    working_dir: /opt/manim