ci: run remote tests on PRs only if they aren't a fork (#2697)

.github/workflows/rust.yml

@@ -125,6 +125,9 @@ jobs:
       - name: Run examples
         run: cargo run --example simple --locked
       - name: Run remote tests
+        # Running this requires access to secrets, so skip if this is
+        # a PR from a fork.
+        if: github.event_name != 'pull_request' || !github.event.pull_request.head.repo.fork
         run: make -C ./lancedb remote-tests
 
   macos: