Meta: Contributor role (#3922)

We had a loosely defined contributor role, but this standardises it
across our contributing guides.

Also specifies that a user needs to have at least one PR merged before
becoming a contributor, which was implied but never explicitly stated
(making things hard for would be contributors!).

.github/ISSUE_TEMPLATE/become-a-repo-collaborator.md

@@ -18,6 +18,7 @@ Give us a few days to review and you should receive an invitation to join. Once
 
 ### Requirements
 
+- [ ] I have at least one merged Pull Request
 - [ ] I have reviewed the [contribution guidelines](https://github.com/googleforgames/agones/blob/main/CONTRIBUTING.md)
 - [ ] I have enabled [2FA on my GitHub account](https://github.com/settings/security)
 - [ ] I have joined the [Agones Slack workspace](https://join.slack.com/t/agones/shared_invite/zt-2mg1j7ddw-0QYA9IAvFFRKw51ZBK6mkQ)

CONTRIBUTING.md

@@ -107,6 +107,13 @@ You can see them on our calendar
 [mailing list or Slack](https://agones.dev/site/community/)
 for notifications.
 
+## Becoming a Contributor on Agones
+
+If you have submitted at least one Pull Request and had it merged, you may wish to become an official contributor.
+This will give you the ability to have tickets assigned to you (or you can assign tickets to yourself!).
+
+We have a [community membership guide](./docs/governance/community_membership.md), that outlines the process.
+
 ## Becoming an Approver on Agones
 
 If you are interested in becoming an Approver on the Agones project and getting commit access to the

docs/governance/community_membership.md

@@ -6,10 +6,11 @@ This is based on the [Kubernetes Community Membership](https://github.com/kubern
 
 There are currently two roles for this project, but that may grow in the future.
 
-| Role | Responsibilities | Requirements | Defined by |
-| -----| ---------------- | ------------ | -------|
-| Releaser | Create Agones releases | Sponsored by 2 approvers | Commit access to the Agones repository |
-| Approver | Review and approve contributions | Sponsored by 2 approvers and multiple contributions to the project | Commit access to the Agones repository and [OWNERS] file approver entry |
+| Role        | Responsibilities                 | Requirements                                                       | Defined by                                                              |
+|-------------|----------------------------------|--------------------------------------------------------------------|-------------------------------------------------------------------------|
+| Contributor | Can have tickets assigned        | Have one PR merged                                                 | Read access to the Agones repository                                    |
+| Releaser    | Create Agones releases           | Sponsored by 2 approvers                                           | Commit access to the Agones repository                                  |
+| Approver    | Review and approve contributions | Sponsored by 2 approvers and multiple contributions to the project | Commit access to the Agones repository and [OWNERS] file approver entry |
 
 
 ## New contributors
@@ -26,6 +27,23 @@ policies, procedures, conventions, etc., and technical and/or writing ability.
 Role-specific expectations, responsibilities, and requirements are enumerated
 below.
 
+## Contributor
+
+For regular contributors that wish to have issues assigned to them, we have the contributor role.
+
+To become a contributor, create an issue using the 
+[become a repo collaborator issue template](https://github.com/googleforgames/agones/issues/new?assignees=thisisnotapril&labels=area%2Fcommunity&projects=&template=become-a-repo-collaborator.md&title=Collaborator+Request)
+and we will review it as a team.
+
+**Defined by:** Read access to the Agones repository.
+
+### Requirements
+
+- Have at least one merged Pull Request.
+- Have reviewed the [contribution guidelines](https://github.com/googleforgames/agones/blob/main/CONTRIBUTING.md)
+- Have enabled [2FA on my GitHub account](https://github.com/settings/security)
+- Have joined the [Agones Slack workspace](https://join.slack.com/t/agones/shared_invite/zt-2mg1j7ddw-0QYA9IAvFFRKw51ZBK6mkQ)
+
 ## Releaser
 
 Releasers are engineers that are able to commit to the Agones repository with