refactoring, more config, packaging

package/debian/veilid-server/DEBIAN/postrm

@@ -0,0 +1,18 @@
+#!/bin/sh
+set -e
+
+if [ -d /run/systemd/system ]; then
+    systemctl --system daemon-reload >/dev/null || true
+fi
+
+if [ "$1" = "remove" ]; then
+    if [ -x "/usr/bin/deb-systemd-helper" ]; then
+        deb-systemd-helper mask 'veilid-server.service' >/dev/null || true
+    fi
+elif [ "$1" = "purge" ]; then
+    if [ -x "/usr/bin/deb-systemd-helper" ]; then
+        deb-systemd-helper purge 'veilid-server.service' >/dev/null || true
+        deb-systemd-helper unmask 'veilid-server.service' >/dev/null || true
+    fi
+    rm -rf /var/db/veilid-server
+fi