Multiple dev one signing key

[john doe]

Hi,

I'm considering working  on a project that has only for now a couple of
developers.
As part of that project everything that will be released will need to be
gpg signed.

What is the best way forward?
- One signing key accessible on the release system
- Eatch dev having a copy of the key to be able to sign a release
- Other suggestions

In other words: What is, if any, the best way to sign a file, when the
same key is to be used by multiple persons.

Any help is appriciated.

--
John Doe