Add OpenRC-Script.md

OpenRC-Script.md

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+For Alpine/postmarketOS/Gentoo/Artix, you can create an OpenRC service as
+`/etc/init.d/uptime-kuma`:
+
+```sh
+#!/sbin/openrc-run
+
+description="Uptime Kuma self-hosted monitoring tool"
+
+# Change $directory to path to uptime-kuma
+directory=${directory:-/usr/share/uptime-kuma}
+pidfile=${pidfile:-/run/$RC_SVCNAME.pid}
+
+log_dir="/var/log/$RC_SVCNAME"
+output_log="${output_log:-$log_dir/output.log}"
+error_log="${error_log:-$log_dir/error.log}"
+
+command=${command:-/usr/bin/node}
+command_args="$directory/server/server.js"
+command_user=${command_user:-uptime-kuma:uptime-kuma}
+command_background=true
+
+depend() {
+	need net
+}
+
+start_pre() {
+	checkpath --owner=$command_user --directory $log_dir \
+						    $directory/data \
+						    $directory/data/upload
+	checkpath --owner=$command_user --file $log_dir/*.log \
+					       $directory/data/error.log \
+					       $directory/data/kuma.db
+}
+
+start_post() {
+	# Wait for the server to be started
+	sleep 10
+}
+```
+
+Set the script to executable.
+
+```sh
+sudo chmod 755 /etc/init.d/uptime-kuma
+```
+
+Create a user and group `uptime-kuma:uptime-kuma` for the service.
+
+```sh
+sudo addgroup -S uptime-kuma
+sudo adduser -S -D -h /var/lib/uptime-kuma -s /sbin/nologin -G uptime-kuma -g uptime-kuma uptime-kuma
+```
+
+If the database is not initialized, it has to be run fisrt.
+
+```sh
+cd /usr/share/uptime-kuma
+sudo -u uptime-kuma node server/server.js
+```
+
+Start the service and add it to default runlevel if prefered.
+
+```sh
+sudo rc-service uptime-kuma start
+sudo rc-update add uptime-kuma
+```