ci: use make target for vendoring docs release

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

.github/workflows/docs-release.yml

@@ -26,7 +26,6 @@ jobs:
         name: Prepare
         run: |
           rm -rf ./data/buildx/*
-          rm -rf ./_vendor/github.com/docker/buildx
           if [ -n "${{ github.event.inputs.tag }}" ]; then
             echo "RELEASE_NAME=${{ github.event.inputs.tag }}" >> $GITHUB_ENV
           else
@@ -52,12 +51,10 @@ jobs:
           cp /tmp/buildx-docs/out/reference/*.yaml ./data/buildx/
       -
         name: Update vendor
-        uses: docker/bake-action@v4
-        with:
-          targets: vendor
-          provenance: false
-          set: |
-            vendor.args.MODULE=github.com/docker/buildx@${{ env.RELEASE_NAME }}
+        run: |
+          make vendor
+        env:
+          VENDOR_MODULE: github.com/docker/buildx@${{ env.RELEASE_NAME }}
       -
         name: Create PR on docs repo
         uses: peter-evans/create-pull-request@a4f52f8033a6168103c2538976c07b467e8163bc