feat: add systemd service examples

systemd/stapps-unit-status-mail.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+MAILTO=`cat ../config/RECIPIENTS`
+UNIT=$1
+
+EXTRA=""
+for e in "${@:2}"; do
+  EXTRA+="$e"$'\n'
+done
+
+UNITSTATUS=$(systemctl status --lines=50 $UNIT)
+
+ssmtp $MAILTO <<EndOfMessage
+To:$MAILTO
+Subject:Status mail for unit: $UNIT
+
+Status report for unit: $UNIT
+$EXTRA
+
+$UNITSTATUS
+EndOfMessage
+
+echo -e "Status mail sent to: $MAILTO for unit: $UNIT"