Honestly this sounds a bit cumbersome. I built my blog years ago using Puput (https://github.com/APSL/puput) and Render, and it has been running strong with minimal maintenance since then, with hundreds of posts. The software is all open source and free other than the minimal hosting fees.

If I want to do a post, I log in, draft the post in a simple rich-text editor with image support and keyboard shortcuts for formatting, and click "publish." I don't have to fool with anything, there is no chance of sync breaking, and it's instantly responsive.

The back-end is stored in Github, but the posts are stored, with revision history, in a Postgres database that I have full access to.

It's hard to envision a scenario where I'd prefer digging through a git repository to see a previous version of a post rather than just clicking into the CMS site and clicking on the historical version of the post that I'd like to look at, where it is instantly displayed including images. And even with daily blogging, the number of times I've actually looked at a prior version of a post is very low -- probably less than once a year.