Fix fatal checkout error in linter workflow by removing ready_for_review trigger

[Copilot]

Purpose

The linter workflow was failing with fatal: bad object during the super-linter step when triggered by the ready_for_review pull_request event. Draft-to-ready conversions can fire before commit refs are consistently available on the runner, causing the SHA-based checkout/diff to fail.

Goals

• Restrict pull_request trigger to [opened, synchronize, reopened], eliminating the unreliable ready_for_review trigger path.
• Preserve existing SHA-pinned checkout (ref: github.event.pull_request.head.sha, fetch-depth: 0) and base-branch fetch logic.

Approach

Single-line change in .github/workflows/linter.yml:

# Before
on:
  pull_request:
    types: [opened, synchronize, reopened, ready_for_review]

# After
on:
  pull_request:
    types: [opened, synchronize, reopened]

The pull_request_review trigger (approved reviews only) and all downstream steps are unchanged.

User stories

N/A — internal CI reliability fix.

Release note

N/A — workflow-only change with no product impact.

Documentation

N/A — no user-facing documentation affected.

Training

N/A

Certification

N/A — no feature or behavioral change.

Marketing

N/A

Automation tests

• Unit tests: N/A
• Integration tests: N/A — validated by the linter workflow itself running cleanly on this PR.

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? N/A (workflow file only)
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Samples

N/A

Related PRs

N/A

Migrations (if applicable)

N/A

Test environment

GitHub Actions / ubuntu-latest

Learning

N/A

Original prompt

Update .github/workflows/linter.yml to fix the fatal checkout error and make the workflow more robust.

Required changes:

• Update the on: section to also trigger on pull_request with types: [opened, synchronize, reopened] in addition to pull_request_review.
• Ensure the code checkout and fetch steps remain, preserving the set SHA logic and full history (fetch-depth: 0).

This will address the fatal: bad object error caused by missing commit references during the linter job.

This pull request was created from Copilot chat.

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