Add GitHub settings (prometheus#1063)

Add a GitHub settings control yaml to manage branch protection for the
Go versions.

Signed-off-by: SuperQ <[email protected]>

Author: SuperQ

.github/settings.yml

@@ -0,0 +1,34 @@
+---
+branches:
+  - name: main
+    protection:
+      # Required. Require at least one approving review on a pull request, before merging. Set to null to disable.
+      required_pull_request_reviews:
+        # The number of approvals required. (1-6)
+        required_approving_review_count: 1
+        # Dismiss approved reviews automatically when a new commit is pushed.
+        dismiss_stale_reviews: false
+        # Blocks merge until code owners have reviewed.
+        require_code_owner_reviews: false
+        # Specify which users and teams can dismiss pull request reviews. Pass an empty dismissal_restrictions object to disable. User and team dismissal_restrictions are only available for organization-owned repositories. Omit this parameter for personal repositories.
+        dismissal_restrictions:
+          users: []
+          teams: []
+      # Required. Require status checks to pass before merging. Set to null to disable
+      required_status_checks:
+        # Required. Require branches to be up to date before merging.
+        strict: false
+        # Required. The list of status checks to require in order to merge into this branch
+        contexts:
+          - DCO
+          - "ci/circleci: go-1-17"
+          - "ci/circleci: go-1-18"
+      # Required. Enforce all configured restrictions for administrators. Set to true to enforce required status checks for repository administrators. Set to null to disable.
+      enforce_admins: false
+      # Prevent merge commits from being pushed to matching branches
+      required_linear_history: false
+      # Required. Restrict who can push to this branch. Team and user restrictions are only available for organization-owned repositories. Set to null to disable.
+      restrictions:
+        apps: []
+        users: []
+        teams: []