Add mkdir ./files to dockerfile

Dockerfile

@@ -14,6 +14,8 @@ ENV PATH="${PATH}:${POETRY_VENV}/bin"
 
 WORKDIR /app
 
+RUN mkdir ./files
+
 COPY . /app
 COPY --from=ffmpeg /usr/local/bin/ffmpeg /usr/local/bin/ffmpeg
 COPY --from=swagger-ui /usr/share/nginx/html/swagger-ui.css swagger-ui-assets/swagger-ui.css