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Migrate from cloudposse/github-action-atmos-component-updater

Replace the legacy updater action with a scheduled workflow that checks out the repository, installs Atmos, and runs:

jobs:
  vendor-update:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    container:
      image: ghcr.io/cloudposse/atmos:${{ vars.ATMOS_VERSION }}
    steps:
      - uses: actions/checkout@v6
      - run: atmos vendor update --pull-request

The native invocation is:

atmos vendor update --pull-request

Do not retain a third-party action for updating, committing, pushing, or opening the PR. Configure update selection in vendor.update and PR metadata in vendor.ci.pull_request.

Legacy action concern Native Atmos replacement
include/exclude component globs vendor.update.groups.<name>.include / .exclude, invoked with --group <name>
individual component selection repeat --component <name>
update-and-pull behavior --pull-request implies --pull
branch, title, body, labels, draft vendor.ci.pull_request
GitHub token input ATMOS_CI_GITHUB_TOKEN, ATMOS_PRO_GITHUB_TOKEN, GITHUB_TOKEN, or GH_TOKEN
action summary Native GitHub step summary

Stage the rollout: first run atmos vendor update --check --group <name> on a non-production group; then enable --pull-request manually; finally schedule it and retire the legacy action. Grant only contents: write and pull-requests: write; add issues: write only when using labels or assignees. The default GITHUB_TOKEN suppresses downstream push workflows; instead of a long-lived PAT or manually-managed GitHub App token, pair the Component Updater with the github/sts auth integration, whose job needs id-token: write for the OIDC exchange: atmos auth exec --identity <github-sts-identity> -- atmos vendor update --pull-request mints a real GitHub App installation token and exports it as ATMOS_PRO_GITHUB_TOKEN, which the Component Updater already prefers over GITHUB_TOKEN.

See the vendoring Component Updater reference for the native operating model.