Update PR template

[aramprice]

NOTE: this repository uses a "Merge Forward" strategy

Changes should be made in the earliest applicable branch, and
merged forward through subsequent branches.

1. Create a PR into the oldest branch (ubuntu-<short_name>)
2. After this PR has been merged create a merge-to-<next_short_name> branch
3. Merge ubuntu-<short_name> into merge-to-<next_short_name>
4. Create a PR to merge merge-to-<next_short_name> into ubuntu-<next_short_name>
5. Repeat as needed for subsequent branches

[Copilot]

Pull request overview

Updates the repository’s pull request template instructions for the “merge forward” workflow, aiming to simplify how changes are propagated across supported Ubuntu stemcell line branches.

Changes:

• Replaces the previous multi-step “merge-to-*” branch instructions with a simpler “PR merges from oldest branch to next branch” flow.
• Updates the example branch naming used in the merge-forward instructions.

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[coderabbitai]

Walkthrough

The pull request updates .github/pull_request_template.md to document a new "merge forward" workflow for branching operations. The instructions now reflect that PRs should be created against the oldest stemcell branch (e.g., ubuntu-<short_name-N>), and after merge, subsequent PRs should merge that branch into the next sequential branch (ubuntu-<short_name-N+1>), repeating as needed. The previous workflow describing merge-to-<next_short_name> intermediary branches has been removed.

Suggested reviewers

• mariash
• mkocher
• selzoc

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'Update PR template' is vague and generic, using non-descriptive language that doesn't convey meaningful information about what specifically changed in the template.	Consider a more specific title like 'Update PR template with Merge Forward strategy' or 'Simplify PR template with streamlined merge process'.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description check	✅ Passed	The PR description matches the repository template structure and includes all required sections with the Merge Forward strategy clearly outlined in a step-by-step format.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update-pr-template

Warning

Review ran into problems

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In @.github/pull_request_template.md:
- Around line 5-6: Update the PR template text that currently uses the
placeholders "ubuntu-<short_name-N>" and "ubuntu-<short_name-N+1>" to include
concrete examples for clarity (e.g., "ubuntu-focal-1" -> "ubuntu-focal-2" or
"ubuntu-20.04-1" -> "ubuntu-20.04-2"); modify the two lines containing those
placeholders so they show both the placeholder and one or two explicit example
branch names to illustrate the intended workflow and reduce ambiguity for
contributors.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 56fb16cd-b124-4af0-bc69-08d1b3b3c77c

📥 Commits

Reviewing files that changed from the base of the PR and between dfe1504 and 9223f9d.

📒 Files selected for processing (1)

• .github/pull_request_template.md