fix(release): set GIT_REV in macOS build to avoid dirty version string (#1958)

Author: severin-amrein

.github/workflows/dre-release.yaml

@@ -40,6 +40,7 @@ jobs:
           set -euo pipefail
           TAG="${GITHUB_REF#refs/tags/}"
           python3 bin/mk-release.py "$TAG"
+          echo "GIT_REV=$(git rev-parse --short HEAD)" >> "$GITHUB_ENV"
 
       - name: Determine Rust toolchain from rust-toolchain.toml
         id: rust