Following the recent launch of SLSA v1.0, we’re announcing a new, GitHub Actions workflow that achieves SLSA Build Track Level 3 for provenance generation. This lets users generate unforgeable provenance, allowing consumers to trust and verify how their software artifacts were built. The container-based SLSA 3 builder is the result of a collaboration between the Google Open Source Security Team (GOSST), the SLSA community, and Project Oak.