From d27ed3722b9d3053eef8250c10fa87837b08fb69 Mon Sep 17 00:00:00 2001
From: Austin Shalit <austinshalit@gmail.com>
Date: Sun, 27 Feb 2022 20:13:58 -0800
Subject: [PATCH] [ci] Set actions workflow concurrency (#4060)

This sets the workflow concurrency to 1 for all workflows. For PRs this means if you push an additional commit older jobs will be cancelled.

The documentation workflow already only runs on tags or merges to main. For this, we cancel previous runs if they are to the same destination (tag or main) but still prevent 2 jobs from running at once if they are spawned from different refs.
---
 .github/workflows/cmake.yml                     | 4 ++++
 .github/workflows/documentation.yml             | 5 +++++
 .github/workflows/gazebo.yml                    | 4 ++++
 .github/workflows/gradle-wrapper-validation.yml | 4 ++++
 .github/workflows/gradle.yml                    | 4 ++++
 .github/workflows/lint-format.yml               | 4 ++++
 .github/workflows/sanitizers.yml                | 4 ++++
 7 files changed, 29 insertions(+)

diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index c0c0be7f66..1b9804c81d 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -2,6 +2,10 @@ name: CMake
 
 on: [pull_request, push]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     strategy:
diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index ab59b0f5fe..4d23eea6d5 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -2,6 +2,10 @@ name: Documentation
 
 on: [push, workflow_dispatch]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   BASE_PATH: allwpilib/docs
 
@@ -10,6 +14,7 @@ jobs:
     name: "Documentation - Publish"
     runs-on: ubuntu-latest
     if: github.repository_owner == 'wpilibsuite' && (github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v'))
+    concurrency: ci-docs-publish
     steps:
       - uses: actions/checkout@v2
         with:
diff --git a/.github/workflows/gazebo.yml b/.github/workflows/gazebo.yml
index 53948fbda0..d08f6ad638 100644
--- a/.github/workflows/gazebo.yml
+++ b/.github/workflows/gazebo.yml
@@ -2,6 +2,10 @@ name: Gazebo
 
 on: [pull_request, push]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     name: "Build"
diff --git a/.github/workflows/gradle-wrapper-validation.yml b/.github/workflows/gradle-wrapper-validation.yml
index c16f58f680..c433132e0c 100644
--- a/.github/workflows/gradle-wrapper-validation.yml
+++ b/.github/workflows/gradle-wrapper-validation.yml
@@ -1,6 +1,10 @@
 name: "Validate Gradle Wrapper"
 on: [pull_request, push]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   validation:
     name: "Validation"
diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index e05b3e6a70..e3aedab516 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -2,6 +2,10 @@ name: Gradle
 
 on: [pull_request, push]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build-docker:
     strategy:
diff --git a/.github/workflows/lint-format.yml b/.github/workflows/lint-format.yml
index 6d806f77a0..91bff89a1a 100644
--- a/.github/workflows/lint-format.yml
+++ b/.github/workflows/lint-format.yml
@@ -6,6 +6,10 @@ on:
     branches-ignore:
       - main
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   wpiformat:
     name: "wpiformat"
diff --git a/.github/workflows/sanitizers.yml b/.github/workflows/sanitizers.yml
index 8c0e516c3f..c5f79518d8 100644
--- a/.github/workflows/sanitizers.yml
+++ b/.github/workflows/sanitizers.yml
@@ -2,6 +2,10 @@ name: Sanitizers
 
 on: [pull_request, push]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     strategy: