chore(gha): add linear.yml GitHub workflow

[ms-bot]

Why is this needed?

This pull request has been created by a robot to add the linear.yml GitHub workflow.

[Copilot]

Pull request overview

Adds a new GitHub Actions workflow intended to integrate pull request activity with Linear (title compliance checks, bot PR → Linear issue creation, and Linear state checks) as part of the repo’s CI policy automation.

Changes:

• Introduces a new Linear workflow triggered on pull_request events and merge_group.checks_requested.
• Runs mobsuccess-devops/github-actions-linear for PR title compliance, bot PR issue creation, and Linear state validation.

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[maximus-agents]

fix-approve-merge report

Outcome: BLOCKED
PR type: BOT_PR
Head commit: ff7a93ae89e04d32a62408af6d01fa3443cd8ae3

What was done

• Inspected the open, non-draft PR, current head, checks, merge eligibility, and all review threads.
• Verified all four Copilot review threads are already resolved and each has the upstream-policy explanation; no unresolved bot thread was found.
• Inspected failed Linear run 29530257585 and confirmed the setup failure: Unable to resolve action mobsuccess-devops/github-actions-linear, not found.
• Verified github-actions-linear is private, non-archived, and defaults to master.
• Attempted read-only inspection of the documented private-action sharing endpoint GET /repos/mobsuccess-devops/github-actions-linear/actions/permissions/access; GitHub returned 403 Resource not accessible by integration. The related repository Actions permissions endpoint and target branch-protection endpoint also returned the same authorization error.

CI

Linear is failing on the current head. No other required-check configuration could be read with this token.

Linear

The workflow cannot download the private composite action before any Linear ticket validation can run.

Why it stopped here

The available bot identity is not authorized to inspect or change the action repository's Actions access policy, so it cannot grant the minimally scoped organization/repository access required to resolve mobsuccess-devops/github-actions-linear. Re-running the workflow was previously rejected with Resource not accessible by integration; no generated workflow edit or unrelated push is permitted. Linear is therefore not genuinely green.

Next steps

A repository/organization Actions administrator must grant mobsuccess-devops/dbt_artifacts (or the organization, as appropriate) access to use the private mobsuccess-devops/github-actions-linear action via that action repository's Settings → Actions → General → Access policy, then rerun the Linear workflow. Once Linear passes, re-check delayed bot reviews, approve, and enable auto-merge.