First fetchmail implementation

fetchmail/Dockerfile

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+FROM python:alpine
+
+RUN apk add --update \
+    fetchmail \
+ && rm -rf /var/cache/apk/*
+
+COPY fetchmail.py /fetchmail.py
+
+RUN mkdir /var/spool/mail \
+ && chown mail: /var/spool/mail
+USER mail
+
+CMD ["/fetchmail.py"]