Check custom image

[ajpanton]

I have a custom image, but it's pretty much a vanilla php one, just with some database extensions installed. The dockerfile is just two lines, which I add directly to the docker compose:

services:
  php:
    build:
      context: .
      dockerfile_inline: |
        FROM php:8-fpm-alpine
        RUN apk add --no-cache postgresql-dev && docker-php-ext-install pdo_pgsql
    ...

Is there any way to have WUD notify me when there's a new php version available? I'm not really sure how it would look for it though. Some tool to add the original php digest somewhere for WUD to read it? Use a label with the complete version number (would probably want to change that FROM command as well to keep track of what's being used)?