Add aiofile

Dockerfile

@@ -1,6 +1,7 @@
 FROM python:alpine AS build
 RUN apk add --no-cache gcc make musl-dev linux-headers git \
  && pip3 wheel --wheel-dir=/wheels \
+      aiofile \
       flask \
       git+https://github.com/Assarius/sanic-prometheus@Sanic_22 \
       kubernetes \
@@ -13,6 +14,15 @@ RUN apk add --no-cache gcc make musl-dev linux-headers git \
       sanic-ext \
       sanic-wtf \
       ecs-logging
+
+# Work around buggy setup.py in caio
+RUN git clone https://github.com/mosquito/caio/ \
+  && cd caio \
+  && python3 setup.py bdist_wheel \
+  && rm /wheels/*caio*.whl \
+  && cp dist/*.whl /wheels/
+
+# Generate image without build dependencies
 FROM python:alpine
 COPY --from=build /wheels /wheels
 RUN pip3 install --no-index /wheels/*.whl && rm -Rfv /wheels