Refactor DDNS updater: switch to Alpine, support multiple domains

- Replace golang base image with alpine for smaller footprint
- Add bash/curl dependencies explicitly
- Refactor script to support multiple domains via arrays
- Improve logging with timestamps and status messages
- Simplify docker-compose configuration
- Remove obsolete build scripts and env files

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ddns.bash

@@ -1,16 +1,32 @@
 #!/bin/bash
-DOMN=primal.host
-PASS=35f5fa4e1fc04d539260a4afaeb42371                   \
-IP0=''
+# Namecheap Dynamic DNS Updater
+# https://www.namecheap.com/support/knowledgebase/article.aspx/29/11/how-to-dynamically-update-the-hosts-ip-with-an-https-request/
+
+declare -a domains
+           domains=( "primal.host" )
+declare -a ipAddrs
+           ipAddrs=( "0.0.0.0" )
+declare -a passwords
+           passwords=( "4e6b91f434284c6d9261d5779b1d560f" )
+
 while true ; do
-	IP1=$(curl --no-progress-meter 'https://api.ipify.org?format=text')
-	if [[ "${IP1}" != "${IP0}" && "${IP1}" != '' ]] ; then
-		OP0=$(curl --no-progress-meter -X GET -d 'host=@' -d "domain=${DOMN}" -d "password=${PASS}" -d "ip=${IP1}" -G 'https://dynamicdns.park-your-domain.com/update')
-		OP1=$(curl --no-progress-meter -X GET -d 'host=*' -d "domain=${DOMN}" -d "password=${PASS}" -d "ip=${IP1}" -G 'https://dynamicdns.park-your-domain.com/update')
-		echo $(date) ${IP0} ${IP1}
-		IP0=${IP1}
-	else
-		echo $(date) ${IP0} ${IP1} .
-	fi
-	sleep 3661
+  ipPublic=$(curl --no-progress-meter 'https://api.ipify.org?format=text')
+  echo "$(date '+%Y-%m-%d %H:%M:%S') Public IP: ${ipPublic}"
+  for i in ${!domains[@]} ; do
+    domain=${domains[$i]}
+    ipAddr=${ipAddrs[$i]}
+    password=${passwords[$i]}
+    if [[ "$ipPublic" != "$ipAddr" ]] ; then
+      for host in '@' '*' ; do
+        response="$(curl --no-progress-meter -G -d "host=$host" -d "domain=$domain" -d "password=$password" -d "ip=$ipPublic" https://dynamicdns.park-your-domain.com/update)"
+        if [[ $(echo $response | grep -c "<ErrCount>0</ErrCount>" -) -ne 1 ]] ; then
+          echo "  ERROR updating ${host}.${domain}: $response"
+        else
+          ipAddrs[${i}]="$ipPublic"
+          echo "  Updated ${host}.${domain} -> ${ipPublic}"
+        fi
+      done
+    fi
+  done
+  sleep 3600
 done