Add link to docs/index.md

Signed-off-by: Seth Michael Larson <[email protected]>

Author: sethmlarson

docs/index.md

@@ -15,6 +15,10 @@ This is a list of materials (surveys, documents, proposals, and so on) released
 * [Build Provenance for All Package Registries](https://repos.openssf.org/build-provenance-for-all-package-registries) - July 2023
   > Guidance for package registries in adopting build provenance to verifiably link a package back to its source code and build instructions.
 
+* [Trusted Publishers for All Package Repositories](https://repos.openssf.org/trusted-publishers-for-all-package-registries) - July 2024
+  > Guidance for package registries in adopting Trusted Publishers to authenticate with package repositories from hosted build environments without using long-lived credentials.
+
+
 ## Proposals
 
 * [Build Provenance and Code-signing for Homebrew](https://repos.openssf.org/proposals/build-provenance-and-code-signing-for-homebrew) - July 2023