feat: configurable base branch name

[TheAlbertDev]

Accepts a new input, base_branch_name, to indicate the name of
the branch containing the README file to be updated. Default
main.

Why:

Closes #4

What's being changed:

  base_branch_name:
    description: "Option name of the base branch (default: main)."
    required: false
    default: "main"

Check off the following:

• For workflow changes, I have verified the Actions workflows function as expected.
• For content changes, I have reviewed the style guide.

[sinsukehlab]

Great!
This PR helps CI course to work.

[TheAlbertDev]

This repo doesn't seem very active... I have tagged the relevant commit in the fork (v1.2.0-beta) so that anyone who wants to can use the proposed changes until they are integrated into the repository someday. The only change to the GitHub action is:

- uses: skills/action-update-step@v1
+ uses: TheAlbertDev/[email protected]

[sinsukehlab]

Thanks for sharing.
I have edited yaml files in my generated CI course to use your fork and it works pretty well.
I think this repo is not very active because it is not a course.
Opening a relevant issue in CI course may make this repo more active.

[QUGL-98-06-15]

TheAlbertDev:feature/run-on-different-branch

[github-actions]

🎉 This PR is included in version 1.2.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[sinsukehlab]

$BASE_BRANCH_NAME env is not set.

[Domsbrother]

Hi