ci: allow arbitrary buildx/buildkit version on workflow dispatch event

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/example.yml

@@ -72,7 +72,3 @@ jobs:
         if: github.event_name != 'pull_request'
         run: |
           docker buildx imagetools inspect ${{ env.DOCKER_IMAGE }}:${{ steps.meta.outputs.version }}
-      -
-        name: Dump context
-        if: always()
-        uses: crazy-max/ghaction-dump-context@v1