Add attestation permissions to publish-rust workflow (#84)

Author: lorisleiva

.github/workflows/publish-rust.yml

@@ -69,6 +69,8 @@ jobs:
     permissions:
       contents: write
       id-token: write
+      attestations: write
+      artifact-metadata: write
     with:
       solana-cli-version: ${{ needs.set_env.outputs.SOLANA_CLI_VERSION }}
       clippy-toolchain: ${{ needs.set_env.outputs.RUST_TOOLCHAIN_NIGHTLY }}