CI: cancel previous jobs in the group

https://stackoverflow.com/a/72408109

.github/workflows/build_dragonflybsd.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_dragonflybsd:
     name: Build on ${{ matrix.box }}

.github/workflows/build_freebsd.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_freebsd:
     name: Build on ${{ matrix.box }}

.github/workflows/build_linux.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_linux:
     name: Build on ${{ matrix.os }}

.github/workflows/build_macos.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_macos:
     name: Build on ${{ matrix.os.name }}

.github/workflows/build_netbsd.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_netbsd:
     name: Build on ${{ matrix.box }}

.github/workflows/build_openbsd.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_openbsd:
     name: Build on ${{ matrix.box }}

.github/workflows/build_windows.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_win:
     name: Build on Windows ${{ matrix.platform.bitness }} as ${{ matrix.config }}