feat: implement branch cleanup #1436
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This pull request adds a new GitHub Actions workflow to automate the cleanup of Git branches on a scheduled basis. The workflow is configured to run weekly, and will expire any branches older than 3 months.
Automation and workflow setup:
.github/workflows/cleanup-branches.ymlto schedule a weekly branch cleanup job using thegrafana/shared-workflows/actions/cleanup-branchesaction.ubuntu-arm64-smalland to use specific versions of theactions/checkoutandcleanup-branchesactions for stability and reproducibility.A sample dry run from Oct 16 shows an approximation of the branches that will be purged when this action is run: https://github.com/grafana/shared-workflows/actions/runs/18574509283/job/52956480404#step:4:384
Part of https://github.com/grafana/deployment_tools/issues/278935