Publishing procedure

This GitHub Action is published to the GitHub Actions Marketplace here: https://github.com/marketplace/actions/setup-dart-sdk

Follow these steps to publish a new version:

1. Land the changes via PRs

2. Make sure the CHANGELOG.md is updated

3. Get confirmation that the changes work by having someone use the new version using a commit tag, e.g.:
   - uses: dart-lang/setup-dart@9a04e6d73cca37bd455e0608d7e5092f881fd603

4. Use the GitHub flow for creating a new release with a release tag (e.g. v1.3):

• Navigate to https://github.com/dart-lang/setup-dart/releases
• Click 'Draft a new release'
• Towards the bottom of the page, click the 'Choose a tag' box and then enter a tag (e.g. v1.3)
• In the release notes field below, paste in the relevant text from the changelog

1. Move the v1 tag to point to the latest v1.x release as per the GitHub guidance

• Find the commit tag: git log --pretty=oneline
• Move the v1 tag it: git tag -f v1 [commit tag]