Deploy: Add install-firewall.sh script

Signed-off-by: Michael Mayer <michael@photoprism.app>

scripts/dist/install-firewall.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+# Install ufw package if needed:
+sudo apt-get update
+sudo apt-get -qq install --no-install-recommends ufw
+
+# Basic ufw firewall setup allowing ssh, http, and https:
+sudo ufw default deny incoming
+sudo ufw default allow outgoing
+sudo ufw allow ssh
+sudo ufw allow http
+sudo ufw allow https
+sudo ufw logging off
+sudo rm -f /var/log/ufw.log
+sudo ufw --force enable