Add (untested) snapcraft workflow for GitHub action. Add documentation about manual snapcraft invokation.
#!/bin/bash
set -e
OWNDIRBASENAME=$(basename $(cd $(dirname "${BASH_SOURCE[0]}") && pwd))
echo "Building docker image"
docker build \
--build-arg UID=$(id -u) \
--build-arg GID=$(id -g) \
--build-arg OWNDIRBASENAME="$OWNDIRBASENAME" \
-t beremiz_public_builder .