Fix GitHub Action to generate changelog

.github/workflows/changelog.yml

@@ -19,16 +19,17 @@ jobs:
           token: ${{ secrets.TOKEN }}
 
       - name: Commit
+        id: commit
         run: |
           git config --local user.email "$CI_EMAIL"
           git config --local user.name "$CI_USER"
-          git add CHANGELOG.md && git commit -m 'Updated CHANGELOG.md' && echo ::set-env name=push::1 || echo "No changes to CHANGELOG.md"
+          git add CHANGELOG.md && git commit -m 'Updated CHANGELOG.md' && echo ::set-output name=push::1 || echo "No changes to CHANGELOG.md"
         env:
           CI_USER: ${{ secrets.GITHUB_USER }}
           CI_EMAIL: ${{ secrets.GITHUB_EMAIL }}
 
       - name: Push
-        if: env.push == 1
+        if: steps.commit.outputs.push == 1
         run: |
           git push "https://$CI_USER:[email protected]/$GITHUB_REPOSITORY.git" HEAD:master
         env: