Fix `fatal: unsafe repository ('/github/workspace' is owned by someon… (

#19)

* Fix `fatal: unsafe repository ('/github/workspace' is owned by someone else)`

Looks like there were some changes to git, and this action currently errors out.

```
fatal: unsafe repository ('/github/workspace' is owned by someone else)
```

The fix is to add a safe directory (tested in a separate repo).

Related Stack Overflow: https://stackoverflow.com/questions/71849415/cannot-add-parent-directory-to-safe-directory-on-git

* Update entrypoint.sh

entrypoint.sh

@@ -2,6 +2,8 @@
 
 set -e
 
+git config --global --add safe.directory /github/workspace
+
 git fetch --tags
 # This suppress an error occurred when the repository is a complete one.
 git fetch --prune --unshallow || true