RUN wget -O - https://dl.jami.net/public-key.gpg | \
tee /usr/share/keyrings/jami-archive-keyring.gpg > /dev/null
RUN sh -c "echo 'deb [signed-by=/usr/share/keyrings/jami-archive-keyring.gpg] https://dl.jami.net/nightly/ubuntu_21.04_qt/ jami main' > /etc/apt/sources.list.d/libqt-jami.list"
# add deb-src entries (needed for next step)
RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list