Add parameter "allow_update" to control reuse of existing tag_name

[wkmyws]

I noticed that when a tag_name already exists, this script reuses the existing tag_name and updates the assets.

Can we add a parameter allow_update to determine whether it is allowed to reuse an existing tag_name? If allow_update is set to false and the tag_name already exists, an error should be thrown.

[vitalykarasik]

I'm curious if you have an idea what is happening here https://github.com/softprops/action-gh-release/issues/403. Thank you, Vitaly

[koss110]

@wkmyws hope it helps: https://github.com/softprops/action-gh-release/issues/403#issuecomment-1909895544