Add repo roles:

This is needed to enable the repo roles defined by
the community here: tinkerbell/org#10

Signed-off-by: Jacob Weinstock <[email protected]>

Author: jacobweinstock

.github/CODEOWNERS

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+/.github/settings.yml @tstromberg
+/.github/CODEOWNERS @tstromberg

.github/settings.yml

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+# Collaborators: give specific users access to this repository.
+# See https://docs.github.com/en/rest/reference/repos#add-a-repository-collaborator for available options
+collaborators:
+  # Maintainers, should also be added to the .github/CODEOWNERS file as owners of this settings.yml file.
+  - username: tstromberg
+    permission: maintain
+  # Approvers
+  - username: mmlb
+    permission: push
+  - username: stephen-fox
+    permission: push
+  # Reviewers
+  - username: displague
+    permission: triage
+  - username: jacobweinstock
+    permission: triage
+  - username: Raj-Dharwadkar
+    permission: triage
+
+  # Note: `permission` is only valid on organization-owned repositories.
+  # The permission to grant the collaborator. Can be one of:
+  # * `pull` - can pull, but not push to or administer this repository.
+  # * `push` - can pull and push, but not administer this repository.
+  # * `admin` - can pull, push and administer this repository.
+  # * `maintain` - Recommended for project managers who need to manage the repository without access to sensitive or destructive actions.
+  # * `triage` - Recommended for contributors who need to proactively manage issues and pull requests without write access.