Fonts are built automatically by GitHub Actions - take a look in the "Actions" tab for the latest build.
If you want to build fonts manually on your own computer:
make buildwill produce font files.
make testwill run FontBakery's quality assurance tests.
make proofwill generate HTML proof files.
The proof files and QA tests are also available automatically via GitHub Actions - look at https://notofonts.github.io/avestan.
For information on how to work on Noto fonts, how the build process works and how to maintain it, see the README file of the notofonts.github.io repository
This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at https://scripts.sil.org/OFL