Update changelog when manifest update

ci/manifest.sh

@@ -10,12 +10,23 @@ for manifest in manifests/*.json; do
     git add -N "${manifest}"
     if ! git diff --exit-code -- "${manifest}"; then
         name="$(basename "${manifest%.*}")"
-        git add "${manifest}"
-        git commit -m "Update ${name}"
+        git stash
+        old_version=$(jq -r '.latest.version' "${manifest}")
+        git stash pop
+        new_version=$(jq -r '.latest.version' "${manifest}")
+        if [[ "${old_version}" != "${new_version}" ]]; then
+            msg="Update \`${name}@latest\` to ${new_version}"
+            sed -i "s/^## \\[Unreleased\\]/## [Unreleased]\\n\\n- ${msg}./" CHANGELOG.md
+            git add "${manifest}" CHANGELOG.md
+        else
+            msg="Update ${name} manifest"
+            git add "${manifest}"
+        fi
+        git commit -m "${msg}"
         has_update=1
     fi
 done
 
-if [[ -n "${has_update:-}" ]]; then
+if [[ -n "${has_update:-}" ]] && [[ -n "${GITHUB_OUTPUT:-}" ]]; then
     echo "success=false" >>"${GITHUB_OUTPUT}"
 fi