Add social media cards about til HOT 6 CLOSED

I'd really love to have screenshots of the posts as the social media card images. I wonder what the best way to achieve that would be?

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Built https://github.com/simonw/puppeteer-screenshot for screenshots. It takes a secret key, so the URL is something like:

https://puppeteer-screenshot.simonw.vercel.app/til.simonwillison.net/til/til/pytest_subprocess-server.md?key=...

I'm going to store the images in the database and use https://github.com/simonw/datasette-media to serve them.

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Added two new secrets to this repo:

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Shipped and tweeted: https://twitter.com/simonw/status/1300868423774212096

It would be better if the aspect ratio was 2x1 though.

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That GitHub Actions run (attempting to rebuild everything) took too long so I'm rebuilding and deploying once on my laptop.

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Shipped. Demo https://twitter.com/simonw/status/1300884226066190337

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