Set up CI and approval requirements (#32)

diff --git a/.asf.yaml b/.asf.yaml
index f5c27d4..76383b2 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -31,3 +31,13 @@
     squash:  true
     merge:   false
     rebase:  false
+  protected_branches:
+    master:
+      required_status_checks:
+        strict: true
+        contexts:
+          - CI
+          - e2e-rust
+      required_pull_request_reviews:
+        dismiss_stale_reviews: true
+        required_approving_review_count: 1