add scheduled GHA workflow to check for changes in the tombstone protobuf schema

Author: supervacuus

.github/workflows/check-tombstone-proto-schema.yml

@@ -0,0 +1,16 @@
+name: Check Tombstone Proto Schema
+
+on:
+  schedule:
+    - cron: '0 9 * * *'
+  workflow_dispatch:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Check for newer Tombstone proto schema
+        run: ./scripts/check-tombstone-proto-schema.sh

scripts/check-tombstone-proto-schema.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+TRACKED_COMMIT="981d145117e8992842cdddee555c57e60c7a220a"
+
+# tail -n +2 to remove the magic anti-XSSI prefix from the Gitiles JSON response
+LATEST_COMMIT=$(curl -sf \
+  'https://android.googlesource.com/platform/system/core/+log/refs/heads/main/debuggerd/proto/tombstone.proto?format=JSON' \
+  | tail -n +2 \
+  | jq -r '.log[0].commit')
+
+if [ -z "$LATEST_COMMIT" ] || [ "$LATEST_COMMIT" = "null" ]; then
+  echo "ERROR: Failed to fetch latest commit from Gitiles" >&2
+  exit 1
+fi
+
+echo "Tracked commit: $TRACKED_COMMIT"
+echo "Latest commit:  $LATEST_COMMIT"
+
+if [ "$LATEST_COMMIT" != "$TRACKED_COMMIT" ]; then
+  echo "Schema has been updated! Latest: https://android.googlesource.com/platform/system/core/+/${LATEST_COMMIT}/debuggerd/proto/tombstone.proto"
+  exit 1
+fi
+
+echo "Schema is up to date."