Add `flatbuffers-64` branch to CI for pushes
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 159c364..90c6cfe 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,6 +9,7 @@
       - "*" # new tag version, like `0.8.4` or else
     branches:
       - master
+      - flatbuffers-64
   pull_request:
     branches:
       - master