Cancel outdated runs of the same workflow

It's useful not to finish workflow and free runners after pushing new changes into the same branch. In most cases, you don't need previous results

.github/workflows/gradle-build-with-detekt.yml

@@ -2,6 +2,12 @@ name: Gradle Build With Detekt
 
 on: [push, pull_request]
 
+# Allow cancelling all previous runs for the same branch
+# See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#concurrency
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ubuntu-20.04

.github/workflows/gradle-build.yml

@@ -2,6 +2,12 @@ name: Gradle Build
 
 on: [push, pull_request]
 
+# Allow cancelling all previous runs for the same branch
+# See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#concurrency
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ubuntu-20.04