Missing tgz package file on gh-pages branch.

I'm using `chart-releaser-actoin`(v1.7.0) to publishing tgz package file and `index.yaml` file.
This is the github action config in my github repository (https://github.com/YunWZ/nacos-k8s/blob/92a42759ca005c8e502787914ddc46600eda395a/.github/workflows/release.yml):
```yaml
...
- name: Run chart-releaser
uses: helm/chart-releaser-action@cae68fefc6b5f367a0275617c9f83181ba54714f # v1.7.0
with:
skip_existing: false
charts_dir: 'charts'
packages_with_index: true
pages_branch: gh-pages
env:
CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
CR_GENERATE_RELEASE_NOTES: true
...
```

And the flowing context is the latest runed job output:
```text
Run helm/chart-releaser-action@cae68fefc6b5f367a0275617c9f83181ba54714f
with:
skip_existing: false
charts_dir: charts
packages_with_index: true
pages_branch: gh-pages
version: v1.7.0
mark_as_latest: true
env:
CR_TOKEN: ***
CR_GENERATE_RELEASE_NOTES: true
Run owner=$(cut -d '/' -f 1 <<< "$GITHUB_REPOSITORY")
Looking up latest tag...
Discovering changed charts since 'nacos-1.0.0'...
Installing chart-releaser on /opt/hostedtoolcache/cr/v1.7.0/x86_64...
Adding cr directory to PATH...
Packaging chart 'charts/nacos'...
Successfully packaged chart in /home/runner/work/nacos-k8s/nacos-k8s/charts/nacos and saved it to: .cr-release-packages/nacos-1.0.0.tgz
Releasing charts...
Preparing worktree (detached HEAD 8[2](https://github.com/yunwz/nacos-k8s/actions/runs/15418324155/job/43387189238#step:6:2)42ad9)
HEAD is now at 8242ad9 remove *.tgz from gh-pages
Pushing to branch "gh-pages"
Everything up-to-date
Updating charts repo index...
Loading index file from git repository index.yaml
Preparing worktree (detached HEAD 82[4](https://github.com/yunwz/nacos-k8s/actions/runs/15418324155/job/43387189238#step:6:4)2ad9)
HEAD is now at 8242ad9 remove *.tgz from gh-pages
Found nacos-1.0.0.tgz
Extracting chart metadata from .cr-release-packages/nacos-1.0.0.tgz
Calculating Hash for .cr-release-packages/nacos-1.0.0.tgz
Updating index index.yaml
From https://github.com/yunwz/nacos-k8s
* branch gh-pages -> FETCH_HEAD
Already up to date.
[detached HEAD b1edc14] Update index.yaml
1 file changed, 19 insertions(+)
create mode 100[6](https://github.com/yunwz/nacos-k8s/actions/runs/15418324155/job/43387189238#step:6:6)44 index.yaml
Pushing to branch "gh-pages"
To https://github.com/yunwz/nacos-k[8](https://github.com/yunwz/nacos-k8s/actions/runs/15418324155/job/43387189238#step:6:8)s
8242ad9..b1edc14 HEAD -> gh-pages
```

I had noticed the `index.yaml` file has been uploaded to `gh-pages` branch, but `acos-1.0.0.tgz` did't upload to `gh-pages` branch. Why?

Start with .github/workflows/release.yml and the logged chart-releaser run. Compare the generated .cr-release-packages/nacos-1.0.0.tgz, the gh-pages branch state, and index.yaml to trace where the package is expected to be published. Done means the documented release flow puts the tgz file on gh-pages alongside the updated index, or clearly explains why it is not intended to do so.

Written by the indexing model from the issue text.