feat: add input to allow pushing to fork

[squat]

Description

This commit fixes #267: it defines a new input for the GH action to
allow pushing the branch to a fork of the parent repository and creating
the PR from that fork to the parent.

Checklist

• [] Tested functionality against a test repository (see "How to test changes")
• Added or updated relevant documentation (leave unchecked if not applicable)

Summary by CodeRabbit

• New Features
  • Introduced new optional push-to-fork input parameter that allows specifying a target fork repository for push operations during pull request creation workflows. This provides enhanced flexibility for fork-based contribution workflows and enables seamlessly pushing changes to alternative repositories while maintaining full pull request capabilities and functionality for automation needs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7573673d-9850-41ca-9aae-ec82f9ba58da

📥 Commits

Reviewing files that changed from the base of the PR and between c58fe46 and 5db1c1d.

📒 Files selected for processing (1)

• action.yml

🚧 Files skipped from review as they are similar to previous changes (1)

• action.yml

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📝 Walkthrough

Walkthrough

Added a new optional push-to-fork input parameter to the action configuration. This parameter accepts an owner/repo-fork formatted value and forwards it to the underlying peter-evans/create-pull-request action step.

Changes

Cohort / File(s)	Summary
Action Input Configuration action.yml	Added optional push-to-fork input parameter and configured it to be passed through to the peter-evans/create-pull-request action step, enabling users to push PR branches to a fork repository.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A fork in the road, both safe and sound,
With least privilege, security's found,
A simple param, so easy to pass,
Protecting the repo with utmost class! 🔒

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding a new input parameter to enable pushing to a fork, which is the primary modification in the PR.
Linked Issues check	✅ Passed	The PR fulfills issue #267 by adding the push-to-fork input and forwarding it to peter-evans/create-pull-request, enabling fork-based PR creation for improved security.
Out of Scope Changes check	✅ Passed	All changes in the PR are directly related to implementing the push-to-fork feature; no out-of-scope modifications are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In @.direnv/flake-inputs/dkw3lzhrskwpi1nchpwhhz12yjq4i2f0-source:
- Line 1: Remove the committed .direnv artifacts and prevent them from being
re-committed: delete the tracked files `.direnv/bin/nix-direnv-reload` and
`.direnv/flake-profile-*.rc` from git history (or at least from the current
commit) using git rm --cached (or git rm) for those paths, add `.direnv/` to
`.gitignore`, commit the removal and .gitignore change, and push the branch;
ensure no other .direnv files remain tracked (verify with git ls-files | grep
.direnv) before creating the PR update.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

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

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4bb142ac-438f-484d-a826-63cbe90b0cf5

📥 Commits

Reviewing files that changed from the base of the PR and between c92eec5 and c58fe46.

📒 Files selected for processing (6)

• .direnv/bin/nix-direnv-reload
• .direnv/flake-inputs/dkw3lzhrskwpi1nchpwhhz12yjq4i2f0-source
• .direnv/flake-inputs/s7bvgynzfisna3jdq2cr4jx73xnhxs27-source
• .direnv/flake-profile-a5d5b61aa8a61b7d9d765e1daf971a9a578f1cfa
• .direnv/flake-profile-a5d5b61aa8a61b7d9d765e1daf971a9a578f1cfa.rc
• action.yml

[grahamc]

This is so great. Thank you so much!