add initial discourse update script

updates/discourse.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+set -e
+
+release=$(curl -L https://api.github.com/repos/discourse/discourse/tags -s | jq -r '.[0].name')
+
+echo "Warning, this scipt is not fully tested yet! Proceed with caution!"
+echo
+read -p "Trying to update to Discourse ${release} – proceed?" -n 1 -r
+echo
+if [[ ! $REPLY =~ ^[Yy]$ ]]
+then
+    [[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1  # https://stackoverflow.com/questions/1885525/how-do-i-prompt-a-user-for-confirmation-in-bash-script
+fi
+echo
+
+basedir=$HOME/discourse
+patch=$HOME/latest.patch
+# not clear why this is a samplefile
+# they seem to do this by hand on the docker repo
+#rubyver=$(< $basedir/.ruby-version.sample)
+rubyver=$(curl -s https://raw.githubusercontent.com/discourse/discourse_docker/main/image/base/slim.Dockerfile | grep -oP '(?<=RUBY_VERSION=)[0-9]+\.[0-9]+\.[0-9]+')
+nodever=$(curl -s https://raw.githubusercontent.com/discourse/discourse_docker/main/image/base/slim.Dockerfile | grep -oP '(?<=nodesource.com/setup_)[0-9]+[0-9]')
+
+cd $basedir
+
+git fetch -q
+
+# attempting not having to use a patchfile
+git stash
+git checkout $(git tag -l | grep -v 'rc[0-9]*$' | sort -V | tail -n 1)
+git stash apply
+
+# failsafe if stash apply causes too much trouble
+#echo "looking for patchfile at [ $patch ], executing if found..."
+#[ -e $patch ] && . $patch
+#echo "command ended with status $?"
+
+#echo ~/.rbenv/versions/$rubyver
+
+if [[ ! -e ~/.rbenv/versions/$rubyver ]]
+then
+    git -C $HOME/.rbenv/plugins/ruby-build pull
+    RUBY_CONFIGURE_OPTS=--with-jemalloc rbenv install
+fi
+
+echo "proceeding with bundle and yarn"
+# upstream does a gem update --system
+# we assume their Gemfile.lock is on track tho
+# and try to avoid problems due to too new gems
+bundle install
+yarn install --frozen-lockfile
+
+RAILS_ENV=production bundle exec rails assets:precompile
+
+read -p "Proceed with migrations? " -n 1 -r
+if [[ ! $REPLY =~ ^[Yy]$ ]]
+then
+    [[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
+fi
+RAILS_ENV=production bundle exec rails db:migrate
+
+systemctl restart --user discourse
+
+sleep 2
+
+systemctl status --user discourse