mailu/services/fetchmail
Abel Alfonso Fírvida Donéstevez 39444c794e Install bash in alpine based images.
This fix https://github.com/Mailu/Mailu/issues/918

Bash shell is used by default in Kubernetes' dashboard console, which is very
useful for admins.
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Dockerfile Install bash in alpine based images.
fetchmail.py Standarize image by using shared / similair layers