Netlify CMS is dead[1] after the core dev left the company, Forestry is also officially dead as of April this year. Netlify CMS got forked into StaticCMS and the team behind Forestry have created TinaCMS. After experimenting with both last week, I recommend the latter if you're building a blog with Astro and want a Git based CMS.
TIL. There's a bug with the text editor where cursor will jump towards the last line. Really annoying and I think it's still not being fixed yet. Had to scour through Github issue to find the fix.
[1]https://answers.netlify.com/t/is-this-project-dead/70988