Fix release workflow (#3079)

This was a regression from
#3070

.github/workflows/release.yaml

@@ -144,6 +144,14 @@ jobs:
             --exclude="examples" \
             .
 
+          # Save the sha256 checksum of the distro archive to the environment
+          sha256_base64="$(shasum --algorithm 256 ${{ github.workspace }}/.github/rules_rust.tar.gz | awk '{ print $1 }' | xxd -r -p | base64)"
+          echo "ARCHIVE_SHA256_BASE64=${sha256_base64}" >> $GITHUB_ENV
+        env:
+          CARGO_BAZEL_GENERATOR_URL: file://${{ github.workspace }}/crate_universe/target/artifacts/x86_64-unknown-linux-gnu/cargo-bazel
+          ARTIFACTS_DIR: ${{ github.workspace }}/crate_universe/target/artifacts
+          URL_PREFIX: https://github.com/${{ github.repository_owner }}/rules_rust/releases/download/${{ env.RELEASE_VERSION }}
+
       # Upload the artifact in case creating a release fails so all artifacts can then be manually recovered.
       - uses: actions/upload-artifact@v3
         with: