Set concurrency group in workflows

.github/workflows/abidiff.yaml

@@ -5,6 +5,10 @@ name: abidiff
 
 on: [push, pull_request]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+
 defaults:
   run:
     shell: sh

.github/workflows/cifuzz.yaml

@@ -1,5 +1,11 @@
 name: CIFuzz
+
 on: [pull_request]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   Fuzzing:
     runs-on: ubuntu-latest

.github/workflows/test.yaml

@@ -20,6 +20,10 @@ on:
         type: boolean
         default: true
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+
 env:
   GTEST_FILTER: ${{ github.event.inputs.gtest_filter || '*' }}