No space left on device : '/home/runner/runners/2.321.0/_diag/pages/f0ea6256-c71e-4546-81ec-4281a3c49dc4_2607dcba-b8e7-54d1-46ae-3171aeb3f852_1.log'

The hosted runner: GitHub Actions 6 lost communication with the server. Anything in your workflow that terminates the runner process, starves it for CPU/Memory, or blocks its network access can cause this error.