Multiple Tags Not Working

I'm using this workflow:

```yaml
name: Publish Docker image
on:
release:
types: [published]
jobs:
push_to_registry:
name: Build Docker image and push it to the registry
runs-on: ubuntu-latest
steps:
- name: Check out the repo
uses: actions/checkout@v2
- name: Set env
run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
- name: Upload image to ECR
uses: appleboy/docker-ecr-action@master
with:
access_key: ${{ secrets.ACCESS_KEY_ID }}
secret_key: ${{ secrets.SECRET_ACCESS_KEY }}
cache_from: ${{ secrets.CACHE }}
repo: mongo-backups
region: eu-west-1
tags: 'latest,${{ env.RELEASE_VERSION }}'
dockerfile: Dockerfile
```

I verified that the tags value is: "latest,1.13.0"

But it adds no tag but `latest`:


Reproduce the GitHub Actions workflow using the `tags` input set to `latest,1.13.0`, with the Dockerfile and Amazon ECR settings shown in the issue. Trace how the action parses and applies multiple tags, then verify the published ECR image contains both `latest` and `1.13.0`.

Written by the indexing model from the issue text.