Add concurrency control

Author: bjester

.github/workflows/check-docs.yml

@@ -2,6 +2,10 @@ name: Docs
 
 on: [push, pull_request]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   pre_job:
     name: Path match check

.github/workflows/check_migrations_sqlite.yml

@@ -2,6 +2,10 @@ name: Migrations for SQLite versions
 
 on: [push, pull_request]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   pre_job:
     name: Path match check

.github/workflows/pre-commit.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - 'release-v**'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   pre_job:
     name: Path match check

.github/workflows/tox.yml

@@ -2,6 +2,10 @@ name: Python tests
 
 on: [push, pull_request]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   pre_job:
     name: Path match check