CI: pass arrays to branches key

lzaoral · lzaoral · commit c434bf1fda4d · 2022-08-03T12:25:11.000+02:00
... as that's what the YAML grammar requires (even though it seems to work
just fine).
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -3,9 +3,9 @@ name: Ubuntu CI
 
 on:
   push:
-    branches: main
+    branches: [main]
   pull_request:
-    branches: main
+    branches: [main]
 
 jobs:
   ubuntu:
diff --git a/.github/workflows/coverity.yml b/.github/workflows/coverity.yml
@@ -3,7 +3,7 @@ name: Coverity
 
 on:
   push:
-    branches: main
+    branches: [main]
 
 jobs:
   coverity:
