Fix CI workflow errors: undefined variables and changesets on PRs

[Copilot]

CI workflow failing with two issues:

1. error: src refspec v3.1.6 does not match any when pushing version tags
2. HttpError: Validation Failed: {"resource":"PullRequest","field":"base","code":"invalid"} when changesets action tries to create release PR

Root Cause

Issue 1 - Git tags: Variables VERSION and MAJOR_VERSION were referenced before assignment in the bash script:

# vX tag
MAJOR_VERSION=${{ steps.get-version.outputs.major_version }}
git tag -fa v$VERSION -m "..."  # $VERSION not yet defined

# vX.Y.Z tag  
VERSION=${{ steps.get-version.outputs.version }}
git tag -fa v$MAJOR_VERSION -m "..."  # Wrong variable for this tag

Issue 2 - Changesets: The changesets action was running on pull requests and trying to create a release PR with an invalid base branch (refs/pull/476/merge).

Changes

Fix 1: Reordered to assign both variables before use:

# Set version variables
VERSION=${{ steps.get-version.outputs.version }}
MAJOR_VERSION=${{ steps.get-version.outputs.major_version }}

# vX.Y.Z tag
git tag -fa v$VERSION -m "..."

# vX tag
git tag -fa v$MAJOR_VERSION -m "..."

Fix 2: Added condition to only run changesets on main branch pushes:

- name: Create Release Pull Request or Publish
  id: changesets
  if: github.event_name == 'push' && github.ref == 'refs/heads/main'
  uses: changesets/action@v1

Original prompt

https://github.com/pmndrs/docs/actions/runs/21281805251/job/61253340342 fix this error

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[abernier]

@copilot err https://github.com/pmndrs/docs/actions/runs/21282697928/job/61256383966

[Copilot]

@copilot err https://github.com/pmndrs/docs/actions/runs/21282697928/job/61256383966

Fixed in 624c499. The changesets action was trying to create a release PR while running on a pull request, causing it to use an invalid base branch. Added a condition to only run the changesets step on pushes to main.