feat: Make debian packages

debian/gatus/DEBIAN/postinst

@@ -0,0 +1,3 @@
+adduser --group --system gatus
+mkdir -p /var/lib/gatus
+chown -R gatus: /var/lib/gatus

debian/gatus/etc/gatus/gatus.yaml

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+web:
+  port: 8081
+storage:
+  type: "sqlite"
+  path: "/var/lib/gatus/gatus.sqlite"
+  maximum-number-of-results: 1000
+endpoints:
+  - name: localhost
+    url: "icmp://127.0.0.1"
+    group: pings
+    interval: 10s
+    conditions:
+      - "[CONNECTED] == true"

debian/gatus/etc/systemd/system/gatus.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=Gatus
+Documentation=https://github.com/TwiN/gatus
+After=network.target network-online.target
+Requires=network-online.target
+
+[Service]
+Type=notify
+User=gatus
+Group=gatus
+Environment=GATUS_CONFIG_PATH=/etc/gatus/gatus.yaml
+ExecStart=/usr/local/bin/gatus
+TimeoutStopSec=5s
+LimitNOFILE=1048576
+PrivateTmp=true
+ProtectSystem=full
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+
+[Install]
+WantedBy=multi-user.target