Mine is also automated, but a lot more lightweight.
I - like OP - use JSON Resume [1]. Besides that I just have a Github Action which creates a PDF and also updates a web-based version [2] hosted in AWS S3. My favourite thing about this setup is that if I want to make a small change I can just log in to Github and commit a quick edit in the repo [3] through Github's web-based UI A new PDF is generated and the web-based version being updates automatically.
[2] http://geoff-clayton-cv.s3-website-eu-west-1.amazonaws.com/