feat: add systemd service examples

config/RECIPIENTS

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+your.mail@address.heres

systemd/stapps-proxy.service

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+[Unit]
+Description=@openstapps/proxy
+Documentation=https://gitlab.com/openstapps/proxy
+After=network-online.target
+Requires=network-online.target
+OnFailure=stapps-unit-status-mail@%n.service
+
+[Service]
+ExecStart=/usr/bin/env docker run --rm --net="host" \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  -v /opt/stapps-compose/proxy/ssl/chain.crt:/etc/nginx/certs/ssl.crt \
+  -v /opt/stapps-compose/proxy/ssl/private.key:/etc/nginx/certs/ssl.key \
+  -v /opt/stapps-compose/proxy/static:/static \
+  registry.gitlab.com/openstapps/proxy/master
+StartLimitBurst=2
+StartLimitIntervalSec=100s
+Restart=always
+RestartSec=20s
+WorkingDirectory=/opt/stapps-compose/proxy
+User=root
+
+[Install]
+WantedBy=multi-user.target

systemd/stapps-unit-status-mail.sh

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+#!/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"

systemd/stapps-unit-status-mail@.service

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+[Unit]
+Description=Unit Status Mailer Service
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/opt/stapps-compose/proxy/systemd/stapps-unit-status-mail.sh %I "Hostname: %H" "Machine ID: %m" "Boot ID: %b"