test: update build.yml github action workflow to cancel if more recent commits are pushed

Signed-off-by: Nick Mitchell <[email protected]>

Author: starpit

.github/workflows/build.yml

@@ -3,6 +3,11 @@ name: Build
 
 on: [push, pull_request]
 
+# cancel any prior runs for this workflow and this PR (or branch)
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   tests:
     name: static checks / linters
@@ -59,4 +64,4 @@ jobs:
       - name: Generate pdl_ast.d.ts
         run: npx json2ts ../src/pdl/pdl-schema.json src/pdl_ast.d.ts --unreachableDefinitions
       - name: Build viewer
-        run: npm run build
+        run: npm run build