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GH Actions: auto-cancel previous builds for same branch

Previously, in Travis, when the same branch was pushed again and the "Auto cancellation" option on the "Settings" page had been turned on (as it was for most repos), any still running builds for the same branch would be stopped in favour of starting the build for the newly pushed version of the branch. To enable this behaviour in GH Actions, a `concurrency` configuration needs to be added to each workflow for which this should applied to. More than anything, this is a way to be kind to GitHub by not wasting resources which they so kindly provide to us for free. Refs: * https://github.blog/changelog/2021-04-19-github-actions-limit-workflow-run-or-job-concurrency/ * https://docs.github.com/en/actions/learn-github-actions/workflow-syntax-for-github-actions#concurrency

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Original file line number	Diff line number	Diff line change
`@@ -10,6 +10,12 @@ on:`
`10`	`10`	`# Allow manually triggering the workflow.`
`11`	`11`	`workflow_dispatch:`
`12`	`12`
	`13`	`+# Cancels all previous workflow runs for the same branch that have not yet completed.`
	`14`	`+concurrency:`
	`15`	`+ # The concurrency group contains the workflow name and the branch name.`
	`16`	`+ group: ${{ github.workflow }}-${{ github.ref }}`
	`17`	`+ cancel-in-progress: true`
	`18`	`+`
`13`	`19`	`jobs:`
`14`	`20`	`fix-style:`
`15`	`21`	`name: Fix Code Style`

Lines changed: 6 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -10,6 +10,12 @@ on:`
`10`	`10`	`# Allow manually triggering the workflow.`
`11`	`11`	`workflow_dispatch:`
`12`	`12`
	`13`	`+# Cancels all previous workflow runs for the same branch that have not yet completed.`
	`14`	`+concurrency:`
	`15`	`+ # The concurrency group contains the workflow name and the branch name.`
	`16`	`+ group: ${{ github.workflow }}-${{ github.ref }}`
	`17`	`+ cancel-in-progress: true`
	`18`	`+`
`13`	`19`	`jobs:`
`14`	`20`	`php-tests:`
`15`	`21`	`runs-on: ubuntu-latest`

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