[Feature] Add "Create Release PR" composite action

[luongvo]

What happened 👀

Create a new Composite workflow create_release_pr to automate the Release pull request creation:

• generate the change log as the Release PR content to list all done tasks and PRs from the last tag on the main branch to the latest HEAD on the develop.
• create the Release PR with the necessary info: title, body, assignee, label, and milestone.

Insight 📝

• To generate the release change log like our Release PR, use https://github.com/mikepenz/release-changelog-builder-action. It helps us generate the change log from a config file, like what we did with https://github.com/release-drafter/release-drafter from [#100] Add new workflow to generate release note and version tag automatically android-templates#245. However, https://github.com/mikepenz/release-changelog-builder-action does not require adding its app to our GitHub organization and can be reused to generate the change log texts for App Distribution release notes or even create releases like release-drafter.

• To create the pull request by checking out a new release branch from develop, we can NOT use https://github.com/peter-evans/create-pull-request because it requires stage changes to create PR. Instead, I realized we can create PR using GitHub CLI 🤩

  • Before creating the release PR, we must check out a new release branch from the current develop.

  • To fetch corresponding milestone info (assuming the milestone matches the current version name), while GitHub CLI does not support milestone API officially, we can use an extension called https://github.com/valeriobelli/gh-milestone 🤩
    This command helps us to get the milestone URL from the milestone name = current version:

    > gh milestone list --query "3.26.0" --json url --jq ".[0].url"  
    https://github.com/luongvo/flutter-survey/milestone/8
    

Proof Of Work 📹

Sample usage:

      - uses: nimblehq/github-actions-workflows/create_release_pr@0.1.10
        with:
          version: ${{ steps.version.outputs.version }}
          changelogConfiguration: ".github/workflows/config/changelog-release.json"
          assignee: bot-nimble

A sample generated Release PR for the current develop 👉 main nimblehq/android-templates#561 🎉

Run log: https://github.com/nimblehq/android-templates/actions/runs/6976881886/job/18985941279

[hoangmirs]

I don't have any big concerns for this 🙏

[andyduong1920]

Thanks @luongvo, this will help me to create the release PRs for more than 15 repos on the GT API 💪

[luongvo]

FYI: if milestone_url is found, that means the milestone from the release version is available from the repo.

[luongvo]

@hoangmirs Please have your final review on this PR, please 👋

[hoangmirs]

🎉