ci/release: evaluate expression for prerelease

Author: abn

.github/workflows/release.yml

@@ -35,15 +35,15 @@ jobs:
         id: check-version
         run: |
           [[ "$(poetry version --short)" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] \
-            || echo ::set-output name=prerelease::true
+            || echo "::set-output name=prerelease::true"
 
       - name: Create Release
         uses: ncipollo/release-action@v1
         with:
           artifacts: "dist/*"
           token: ${{ secrets.GITHUB_TOKEN }}
           draft: false
-          prerelease: steps.check-version.outputs.prerelease == 'true'
+          prerelease: ${{ steps.check-version.outputs.prerelease == 'true' }}
 
       - name: Publish to PyPI
         env: