feat: Add GitHub Workflow for Publishing to pub.dev

[oriventi]

Summary

This PR introduces a GitHub Actions workflow that automates publishing to pub.dev whenever a new release or tag is created. The feature is implemented through a new file added to the .github/workflows directory.

Workflow Details

• Workflow Name: Publish to pub.dev
• Trigger: The workflow is triggered on a push event with tags that follow the semantic versioning pattern (v[0-9]+.[0-9]+.[0-9]+*), such as v1.2.3.
• Implementation: The workflow uses the dart-lang/setup-dart/.github/workflows/publish.yml@v1 reusable workflow from the official documentation.

Benefits

• Collaborators-Friendly: This workflow allows collaborators to publish to pub.dev simply by creating a new release or tag, streamlining the release process.
• Owner’s Setup: To enable this automation, the project owner needs to enable automated publishing on pub.dev for this package. (A screenshot demonstrating how to enable this setting is attached below.)

Steps for Owners to Enable Automated Publishing

To enable this workflow, the package owner must:

1. Go to the pub.dev package admins section.
2. Enable "Automated Publishing" by following the provided screenshot.

[aagarwal1012]

@oriventi, I have updated the config on my side as per the details mentioned.
cc: @queendevelopers

[queendevelopers]

Hi @oriventi, just checking in—do we still need this PR, or can it be closed?

[oriventi]

Hey @queendevelopers,
Yeah, this PR would be super helpful! Right now only @aagarwal1012 is able to publish new versions to pub.dev.
This adds a GitHub workflow that lets collaborators like you publish too - just update the version in pubspec.yaml and changelog.md, tag a commit with vX.X.X, and it'll automatically push to pub.dev. Since you're active here, it makes sense for you to be able to publish updates too. What do you think?

[queendevelopers]

Hey @queendevelopers, Yeah, this PR would be super helpful! Right now only @aagarwal1012 is able to publish new versions to pub.dev. This adds a GitHub workflow that lets collaborators like you publish too - just update the version in pubspec.yaml and changelog.md, tag a commit with vX.X.X, and it'll automatically push to pub.dev. Since you're active here, it makes sense for you to be able to publish updates too. What do you think?

Sound good! Actually, having this feature is a great way to keep package up-to-date with repository. Thank You!

[queendevelopers]

Looks great! Approved. Thanks!

[aagarwal1012]

@queendevelopers, I don't think there is the need to add id-token -- if not can you point me on how to generate the id token?

[queendevelopers]

@queendevelopers, I don't think there is the need to add id-token -- if not can you point me on how to generate the id token?

Apologies, my mistake. I believe everything should be good now. Thank you for reviewing!