[Feature] `push` and or `commit` input

I think there are plenty of reasons why you do not want this action to commit or push the file, like adding the changelog to a github-release or posting the changelog into a comment in a PR or issue.

### Proposed inputs
```
push: if false the commited changes wont be pushed (default: true)
commit: if false changes wont be commited (default: true)
```