chore: add configs for automation bots (#523)

* chore: add configs for automation bots

* chore: remove Auto-approve.yml check

Author: Takashi Matsuo

.github/snippet-bot.yml

@@ -0,0 +1 @@
+# Empty snippet-bot config file

.github/sync-repo-settings.yaml

@@ -0,0 +1,20 @@
+rebaseMergeAllowed: true
+squashMergeAllowed: true
+mergeCommitAllowed: false
+branchProtectionRules:
+- pattern: main
+  isAdminEnforced: true
+  requiredStatusCheckContexts:
+    - gcb-presubmit-node14 (firestore-nodejs-getting-start)
+    - cla/google
+    - snippet-bot check
+  requiredApprovingReviewCount: 1
+  requiresCodeOwnerReviews: true
+  requiresStrictStatusChecks: true
+permissionRules:
+  - team: Googlers
+    permission: pull
+  - team: nodejs-samples-reviewers
+    permission: push
+  - team: nodejs-docs-samples-owners
+    permission: admin