chore: add sync-repo-settings and exclude unit 3.7 (#287)

Author: chelsea-lin

.github/sync-repo-settings.yaml

@@ -0,0 +1,34 @@
+# https://github.com/googleapis/repo-automation-bots/tree/main/packages/sync-repo-settings
+# Rules for main branch protection
+branchProtectionRules:
+# Identifies the protection rule pattern. Name of the branch to be protected.
+# Defaults to `main`
+- pattern: main
+  requiresCodeOwnerReviews: true
+  requiresStrictStatusChecks: false
+  requiredStatusCheckContexts:
+    - 'conventionalcommits.org'
+    - 'cla/google'
+    - 'docs'
+    - 'lint'
+    - 'unit (3.8)'
+    - 'unit (3.9)'
+    - 'unit (3.10)'
+    - 'unit (3.11)'
+    - 'unit (3.12)'
+    - 'cover'
+permissionRules:
+  - team: actools-python
+    permission: admin
+  - team: actools
+    permission: admin
+  - team: api-bigquery
+    permission: push
+  - team: api-bigquery-dataframe
+    permission: push
+  - team: yoshi-python
+    permission: push
+  - team: python-samples-owners
+    permission: push
+  - team: python-samples-reviewers
+    permission: push