fix(release): checkout main branch before pushing version bump

The release workflow was failing because the release event checks out
the repository at the tag (detached HEAD state), not on the main branch.
When the workflow tried to 'git push origin main', it failed with
'error: src refspec main does not match any'.

This fix adds a step to explicitly checkout the main branch after the
initial checkout, ensuring we're on a proper branch before making and
pushing version bump commits.

Author: Subterrane

.github/workflows/release.yml

@@ -24,6 +24,17 @@ jobs:
           VERSION="${VERSION#v}"
           echo "version=$VERSION" >> $GITHUB_OUTPUT
 
+      - name: Checkout main branch
+        run: |
+          # Validate we're releasing from main branch
+          if [ "${{ github.event.release.target_commitish }}" != "main" ]; then
+            echo "Error: Release was not created from 'main' branch (target_commitish=${{ github.event.release.target_commitish }})."
+            exit 1
+          fi
+          # Checkout main branch (release event checks out the tag, putting us in detached HEAD)
+          git checkout main
+          git pull origin main
+
       - name: Update version in files
         run: |
           VERSION="${{ steps.get_version.outputs.version }}"
@@ -39,12 +50,7 @@ jobs:
           git config user.email "github-actions[bot]@users.noreply.github.com"
           git add GNUmakefile README.md
           # Commit if there are changes (may not be if version files already match)
-          git commit -m "chore: bump version to ${{ steps.get_version.outputs.version }}" || echo "No changes to commit"
-          # Validate we're on main branch before pushing
-          if [ "${{ github.event.release.target_commitish }}" != "main" ]; then
-            echo "Error: Release was not created from 'main' branch (target_commitish=${{ github.event.release.target_commitish }})."
-            exit 1
-          fi
+          git diff --staged --quiet || git commit -m "chore: bump version to ${{ steps.get_version.outputs.version }}"
           # Push to main
           git push origin main