Support customize GitHub attestations name

```diff
- name: Attest
uses: actions/attest-build-provenance@v2
with:
subject-path: "target/distrib/*${{ join(matrix.targets, ', ') }}*"
+ subject-name:
```

Start with the release workflow that produces the shown actions/attest-build-provenance@v2 step and trace how its inputs are configured. Identify the configuration path for subject-name, then verify that the generated workflow passes the requested value to the action while retaining current behavior when it is unset.

Written by the indexing model from the issue text.