fix(ci): use gh workflow run instead of raw curl for dispatch

The curl-based dispatch kept failing with exit 22 even after granting
actions:write. -sf suppressed the response body, so the real error was
invisible. Switch to `gh workflow run`, which authenticates from
GH_TOKEN automatically and surfaces clear errors if it still fails.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jensens

.github/workflows/check-thumbor.yaml

@@ -46,10 +46,8 @@ jobs:
 
       - name: Trigger rebuild if new version
         if: steps.check.outputs.exists == 'no'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           echo "New Thumbor version ${{ steps.pypi.outputs.version }} detected — triggering rebuild"
-          curl -sf -X POST \
-            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
-            -H "Accept: application/vnd.github.v3+json" \
-            "https://api.github.com/repos/${{ github.repository }}/actions/workflows/docker.yaml/dispatches" \
-            -d '{"ref":"main"}'
+          gh workflow run docker.yaml --repo "${{ github.repository }}" --ref main