CI: enable auto-cancel for GitHub Actions

.github/workflows/ci.yml

@@ -2,7 +2,8 @@ name: CI
 
 on:
   push:
-    branches: [master]
+    branches:
+      - master
   pull_request:
     branches:
       - master
@@ -20,6 +21,10 @@ jobs:
       run:
         shell: bash -l {0}
 
+    concurrency:
+      group: ${{ github.ref }}-checks
+      cancel-in-progress: true
+
     steps:
     - name: Checkout
       uses: actions/checkout@v2
@@ -93,8 +98,12 @@ jobs:
   web_and_docs:
     name: Web and docs
     runs-on: ubuntu-latest
-    steps:
 
+    concurrency:
+      group: ${{ github.ref }}-web-docs
+      cancel-in-progress: true
+
+    steps:
     - name: Checkout
       uses: actions/checkout@v2
       with:
@@ -148,8 +157,11 @@ jobs:
     strategy:
       matrix:
         pattern: ["not slow and not network and not clipboard", "slow"]
-    steps:
+    concurrency:
+      group: ${{ github.ref }}-data_manager-${{ matrix.pattern }}
+      cancel-in-progress: true
 
+    steps:
     - name: Checkout
       uses: actions/checkout@v2
       with:

.github/workflows/database.yml

@@ -2,7 +2,8 @@ name: Database
 
 on:
   push:
-    branches: [master]
+    branches:
+      - master
   pull_request:
     branches:
       - master
@@ -28,6 +29,10 @@ jobs:
         ENV_FILE: [ci/deps/actions-37-db-min.yaml, ci/deps/actions-37-db.yaml]
       fail-fast: false
 
+    concurrency:
+      group: ${{ github.ref }}-${{ matrix.ENV_FILE }}
+      cancel-in-progress: true
+
     services:
       mysql:
         image: mysql

.github/workflows/posix.yml

@@ -2,7 +2,8 @@ name: Posix
 
 on:
   push:
-    branches: [master]
+    branches:
+      - master
   pull_request:
     branches:
       - master
@@ -43,6 +44,9 @@ jobs:
       LC_ALL: ${{ matrix.settings[4] }}
       PANDAS_TESTING_MODE: ${{ matrix.settings[5] }}
       TEST_ARGS: ${{ matrix.settings[6] }}
+    concurrency:
+      group: ${{ github.ref }}-${{ matrix.settings[0] }}
+      cancel-in-progress: true
 
     steps:
     - name: Checkout

.github/workflows/pre-commit.yml

@@ -3,11 +3,15 @@ name: pre-commit
 on:
   pull_request:
   push:
-    branches: [master]
+    branches:
+      - master
 
 jobs:
   pre-commit:
     runs-on: ubuntu-latest
+    concurrency:
+      group: ${{ github.ref }}-pre-commit
+      cancel-in-progress: true
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-python@v2

.github/workflows/python-dev.yml

@@ -16,6 +16,10 @@ jobs:
     name: actions-310-dev
     timeout-minutes: 60
 
+    concurrency:
+      group: ${{ github.ref }}-dev
+      cancel-in-progress: true
+
     steps:
     - uses: actions/checkout@v2
       with: