component email gateway: convert `autocrypt` header: Autocrypt header must be transmitted in both directions to allow opportunistic end-to-end encryption with this protocol. Moved email validation regex to `tools/common/regex.py`, as it can be used in other locations. rel 456

ARG REVISION
FROM libervia/web:${REVISION:-dev}

LABEL maintainer="Goffi <tmp_dockerfiles@goffi.org>"

ARG DEBIAN_FRONTEND=noninteractive

USER root

COPY --chown=root:root libervia.conf /etc/libervia.conf

WORKDIR /home/libervia
USER libervia