Add system startup snippets

Signed-off-by: Shin'ya Minazuki <shinyoukai@laidback.moe>

system-startup/README.md

@@ -0,0 +1,8 @@
+# Description
+Supervisor-specific snippets for launching Gatus at system startup
+
+## Currently supported
+* [Immortal](https://immortal.run)
+* [Mokou](https://svn2.nishi.boats/svn/mokou)
+* systemd
+

system-startup/gatus.conf

@@ -0,0 +1,6 @@
+# Configuration file snippet for mokou(8)
+# Requires daemonize(1)
+description=Developer-oriented health dashboard
+exec=/usr/bin/daemonize -p /var/run/gatus.pid -u gatus -E GATUS_CONFIG_PATH=/usr/local/etc/gatus.yml /usr/local/bin/gatus
+pidfile=/var/run/gatus.pid
+

system-startup/gatus.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=Developer-oriented health dashboard
+Documentation=https://gatus.io
+After=network-online.target
+After=postgresql.service
+
+[Service]
+Type=simple
+User=gatus
+Group=gatus
+WorkingDirectory=/etc/gatus
+Restart=on-failure
+ExecStart=/usr/local/bin/gatus
+Environment=GATUS_CONFIG_PATH=/usr/local/etc/gatus.yml
+
+[Install]
+WantedBy=multi-user.target

system-startup/gatus.yml

@@ -0,0 +1,4 @@
+cmd: /usr/local/bin/gatus
+env:
+  GATUS_CONFIG_PATH: "/usr/local/etc/gatus.yml"
+user: gatus