Update Dockerfile

mysql/Dockerfile

@@ -31,12 +31,13 @@ RUN adduser \
     --no-create-home \
     --uid "${UID}" \
     appuser
+
+RUN mkdir -p /app && chown -R appuser:appuser /app
+
 USER appuser
 
 COPY --from=build /bin/server /bin/
 
-RUN mkdir -p /app
-
 WORKDIR /app
 
 EXPOSE 1999