Add auto cancel in progress

This will cancel CI and docs workflows currently running when a newer version is triggered.

Author: jpraynaud

.github/workflows/ci.yml

@@ -9,6 +9,10 @@ on:
       - 'mithril-explorer/**'
       - '.github/workflows/docs.yml'
 
+concurrency:
+  group: ci-build-test-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build-ubuntu-X64:
     runs-on: ubuntu-22.04

.github/workflows/docs.yml

@@ -5,6 +5,10 @@ on:
     branches: # only run on branch push, tag push will be ignored
       - '**'
 
+concurrency:
+  group: ci-docs-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   cargo-doc:
     runs-on: ubuntu-22.04