ci: implement release-please to automate release creation

[rmartins90]

Short description

This PR implements automated releases using Google's release-please GitHub Action. Automating version bumping, changelog management, and release creation will streamline our release process.

Before:

• Manually update CHANGELOG.md
• Manually bump version numbers
• Manually create GitHub release
• Manually write release notes

After:

• All above steps are automated based on conventional commits
• Release PR provides opportunity to review changes before publishing
• Consistent changelog format and version management

Migration Note

Existing CHANGELOG.md content should be preserved. Release-please manages new entries while maintaining the historical changelog. But this needs to be validated further in the first release PR.

Changes

• Added release-please GitHub Action workflow
• Added release-please configuration
• Updated publish workflow to trigger on tag creation
• Updated PR template to remove unnecessary manual steps

How it works

1. Developers use conventional commits (e.g., feat:, fix:, etc.)
2. When commits are pushed to main, release-please:
   • Creates/updates a release PR with changelog and version updates
   • When the release PR is merged, creates a GitHub release and tag
3. The new tag triggers the publish workflow to publish to npm

PR Checklist

• Added tests for bugs / new features
• Updated docs (storybooks, readme)

[henningmu]

Thank you for doing this, Rui 👏

Can you please add the action that enforces semantic PR titles to this PR (copy from todoist-web)?

Do you think we should mention that releases / versioning is done based on semantic commits (PR titles) in the PULL_REQUEST_TEMPLATE?

[rmartins90]

Can you please add the action that enforces semantic PR titles to this PR (copy from todoist-web)?

Absolutely. Just did.

Do you think we should mention that releases / versioning is done based on semantic commits (PR titles) in the PULL_REQUEST_TEMPLATE?

Same 🙂

Can you please review again?

[henningmu]

Looks great 👏

Left some minor comments, but I don't need to see this again 🙌

[gnapse]