fix output name

this solves the "create new release" issue as well as tag conflicts with
branch name

.github/workflows/release.yml

@@ -175,6 +175,7 @@ jobs:
     - name: Download build artifacts
       uses: actions/download-artifact@v4
     - name: Get short SHA
+      id: vars
       run: echo "short_sha=${GITHUB_SHA::7}" >> "$GITHUB_OUTPUT"
     - name: Create Pre-Release
       if: ${{ !startsWith(github.ref, 'refs/tags/') }}