cancel redundant builds

sfackler · sfackler · commit 189c02672f78 · 2021-12-06T19:15:55.000-05:00
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -12,6 +12,10 @@ env:
   RUSTFLAGS: -Dwarnings
   RUST_BACKTRACE: 1
 
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   rustfmt:
     name: rustfmt
