[ci] automatically cancel GitHub Actions runs for outdated commits (#5651)

.github/workflows/cuda.yml

@@ -9,6 +9,11 @@ on:
     - master
     - release/*
 
+# automatically cancel in-progress builds if another commit is pushed
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   github_actions: 'true'
   os_name: linux

.github/workflows/python_package.yml

@@ -9,6 +9,11 @@ on:
     - master
     - release/*
 
+# automatically cancel in-progress builds if another commit is pushed
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   CONDA_ENV: test-env
   GITHUB_ACTIONS: 'true'

.github/workflows/r_package.yml

@@ -9,6 +9,11 @@ on:
     - master
     - release/*
 
+# automatically cancel in-progress builds if another commit is pushed
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   # hack to get around this:
   # https://stat.ethz.ch/pipermail/r-package-devel/2020q3/005930.html

.github/workflows/static_analysis.yml

@@ -11,6 +11,11 @@ on:
     - master
     - release/*
 
+# automatically cancel in-progress builds if another commit is pushed
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   COMPILER: 'gcc'
   CONDA_ENV: test-env