refactor: certbot stuff

it's weird

servers/link/docker-compose.d/custom/nginx/entrypoint.sh

@@ -4,9 +4,16 @@ trap exit TERM
 
 if [ -n "${CERTBOT_DOMAINS}" ]; then
     echo "registering..."
-    certbot --nginx -n --keep --agree-tos \
-        -m "${CERTBOT_EMAIL}" \
-        -d "${CERTBOT_DOMAINS}"
+    if ! certbot show_account; then
+        certbot register -n \
+            --agree-tos \
+            -m "${CERTBOT_EMAIL}"
+    fi
+
+    for d in $(echo "${CERTBOT_DOMAINS}" | sed 's/,/ /g'); do
+        echo "requesting for $d..."
+        certbot --nginx -n --keep -d "$d"
+    done
 
     while :; do
         echo "renewing domains..."