migrate blocklist to a txt file

this allows easy copy/pasting of existing deny lists which contain
comments and blank lines

src/scripts/setblocklist.sh

@@ -14,10 +14,12 @@ fi
 
 ipset flush cloudron_blocklist
 
-user_firewall_json="/home/yellowtent/boxdata/firewall-config.json"
-if blocklist=$(node -e "console.log(JSON.parse(fs.readFileSync('${user_firewall_json}', 'utf8')).blocklist.join(' '))" 2>/dev/null); then
+user_firewall_json="/home/yellowtent/boxdata/firewall/blocklist.txt"
 
-    for ip in ${blocklist}; do
-        ipset add cloudron_blocklist "${ip}"
-    done
+if [[ -f "${user_firewall_json}" ]]; then
+    while read -r line; do
+        [[ -z "${line}" ]] && continue # ignore empty lines
+        [[ "$line" =~ ^#.*$ ]] && continue # ignore lines starting with #
+        ipset add cloudron_blocklist "${line}"
+    done < "${user_firewall_json}"
 fi