Create the changelog before creating the mergeback branch

Author: aeisenberg

.github/workflows/post-release-mergeback.yml

@@ -108,6 +108,17 @@ jobs:
           # - `--force` since we're overwriting the `vN` tag
           git push origin --atomic --force refs/tags/"${VERSION}" refs/tags/"${major_version_tag}"
 
+      - name: Prepare partial Changelog
+        env:
+          PARTIAL_CHANGELOG: "${{ runner.temp }}/partial_changelog.md"
+          VERSION: "${{ steps.getVersion.outputs.version }}"
+        run: |
+          python .github/workflows/script/prepare_changelog.py CHANGELOG.md "$VERSION" > $PARTIAL_CHANGELOG
+
+          echo "::group::Partial CHANGELOG"
+          cat $PARTIAL_CHANGELOG
+          echo "::endgroup::"
+
       - name: Create mergeback branch
         if: ${{ steps.check.outputs.exists != 'true' && endsWith(github.ref_name, steps.getVersion.outputs.latest_release_branch) }}
         env:
@@ -151,24 +162,15 @@ jobs:
             --assignee "${GITHUB_ACTOR}" \
             --draft
 
-
-      - name: Prepare the partial Changelog
-        env:
-          VERSION: "${{ steps.getVersion.outputs.version }}"
-          PARTIAL_CHANGELOG: "${{ runner.temp }}/partial_changelog.md"
-        run: |
-          # Prepare the partial changelog for the release notes
-          python .github/workflows/script/prepare_changelog.py CHANGELOG.md "$VERSION"> $PARTIAL_CHANGELOG
-
       - name: Create the GitHub release
         env:
-          VERSION: "${{ steps.getVersion.outputs.version }}"
           PARTIAL_CHANGELOG: "${{ runner.temp }}/partial_changelog.md"
+          VERSION: "${{ steps.getVersion.outputs.version }}"
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           # Do not mark this release as latest. The most recent CLI release must be marked as latest.
           gh release create \
             "$VERSION" \
             --latest=false \
-            -t "$VERSION" \
-            -F "$PARTIAL_CHANGELOG"
+            --title "$VERSION" \
+            --notes-file "$PARTIAL_CHANGELOG"