build: add srs yaml file (#1065)

* build: add sync-repo-settings and change branch protection
Source-Link: googleapis/synthtool@ed8079c
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:80bfa0c67226453b37b501be7748b2fa2a2676cfeec0012e79e3a1a8f1cbe6a3

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest
-  digest: sha256:dc7bfb4c4bf50496abbdd24bd9e4aaa833dc75248c0a9e3a7f807feda5258873
-# created: 2022-04-14T17:36:54.629564643Z
+  digest: sha256:80bfa0c67226453b37b501be7748b2fa2a2676cfeec0012e79e3a1a8f1cbe6a3
+# created: 2022-04-14T19:57:08.518420247Z

.github/sync-repo-settings.yaml

@@ -0,0 +1,17 @@
+branchProtectionRules:
+  - pattern: main
+    isAdminEnforced: true
+    requiredApprovingReviewCount: 1
+    requiresCodeOwnerReviews: true
+    requiresStrictStatusChecks: false
+    requiredStatusCheckContexts:
+      - "ci/kokoro: Samples test"
+      - "ci/kokoro: System test"
+      - docs
+      - lint
+      - test (10)
+      - test (12)
+      - test (14)
+      - cla/google
+      - windows
+      - OwlBot Post Processor