ci: do not duplicate events

Author: jcelerier

.github/workflows/android.yml

@@ -10,6 +10,10 @@ on:
       - '**.md'
       - 'docs/**'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ubuntu-latest

.github/workflows/book.yml

@@ -6,6 +6,10 @@ on:
       - master
   pull_request:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   deploy:
     runs-on: ubuntu-latest
@@ -30,4 +34,4 @@ jobs:
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./output
-  
+  

.github/workflows/build_cmake.yml

@@ -10,6 +10,10 @@ on:
       - '**.md'
       - 'docs/**'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     name: ${{ matrix.config.name }}-${{ matrix.library_mode }}-${{ matrix.boost }}Boost

.github/workflows/build_python.yml

@@ -10,6 +10,10 @@ on:
       - '**.md'
       - 'docs/**'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     name: ${{ matrix.config.name }}

.github/workflows/mingw.yml

@@ -10,6 +10,10 @@ on:
       - '**.md'
       - 'docs/**'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   mingw:
     runs-on: windows-latest