Where to write a blog post if you don't have a blog?

I don't have a blog and I don't want to set one up. It would just be another personal website being abandoned after one or two blog posts.

But now I was working on a solution for a problem where I think it might be beneficial for others if they encounter the same problem. Where can I just write an article about it and publish it?

Something that came into my mind was github gist, but maybe there are other ways to just publish a post.