fixed permissions on migrations file

Author: tlkh

Dockerfile

@@ -43,6 +43,8 @@ RUN curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py && \
     pip install --upgrade --no-cache-dir -r requirements.txt && \
     rm -rf get-pip.py ~/.cache
 
+RUN chmod -R 777 /app
+
 USER opensutd
 
 EXPOSE 8000