ARG DISTRO=alpine:3.14.3 FROM $DISTRO ARG VERSION ENV TZ Etc/UTC LABEL version=$VERSION # python3 shared with most images RUN apk add --no-cache \ python3 py3-pip bash tzdata \ && pip3 install --upgrade pip # Image specific layers under this line RUN apk add --no-cache fetchmail ca-certificates openssl \ && pip3 install requests RUN mkdir -p /data COPY fetchmail.py /fetchmail.py CMD ["/fetchmail.py"] RUN echo $VERSION >> /version