Since i haven't found any images of emacs for rpi, i decided to quickly make my own.
For headless "server" services. I use elfeed and i like to have elfeed server running somewhere
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Build image
docker build -t scvhapps/emacs https://github.com/schvabodka-man/emacs-rpi-docker.git
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And just run it
docker run -d --restart always \ --name=elfeed \ -v /home/pi/.emacs.d:/root/config \ scvhapps/emacs
Notice that emacs takes your config from /root/config dir instead of default .emacs.d. This have been done to prevent cluttering your host .emacs.d with stuff