Set up CI builds

support/postinst

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+if ! id -u siahsd >/dev/null 2>&1; then
+    useradd \
+        --no-user-group \
+        --system \
+        --create-home \
+        --home-dir /var/lib/siahsd \
+        --shell /usr/sbin/nologin siahsd \
+fi
+
+systemctl daemon-reload
+systemctl restart siahsd.service
+systemctl enable siahsd.service

support/systemd.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=SIA-HS daemon
+After=network.target
+
+[Service]
+Type=forking
+PIDFile=/var/lib/siahsd/siahsd.pid
+Restart=always
+RestartSec=10s
+ExecStartPre=-/bin/rm /var/lib/siahsd/siahsd.pid
+ExecStart=/usr/bin/siahsd
+User=siahsd
+
+[Install]
+WantedBy=multi-user.target