Suggestion

Idea & investigation courtesy of @JamesHenry. Paraphrasing informal Discord comments:

Right now the Netlify bot is updating comments on open PRs whenever other PRs get merged. So the accessibility bot just floods our available jobs per the above screenshot - blocking much more valuable things from running at all.

I'd really only intended for the bot to make sure humans are posting alt text. Bot posts such as Netlify's are generally pretty consistent in whether they post alt text. We don't need to redundantly keep re-checking bots.

Let's change the accessibility-alt-text-bot workflow to only run if the author isn't a bot.