Bugfix: pages build action fails on dependabot PR merge

Why:
The Dependabot GITHUB_TOKEN is readonly and it doesn't have permissions
to write to kroxylicious when it tries to push ghpages. Instead we use
a PAT to checkout/push which has read/write perms.

Signed-off-by: Robert Young <robeyoun@redhat.com>

Author: robobario

.github/workflows/asciidoctor-ghpages.yaml

@@ -7,6 +7,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.KROXYLICIOUS_GITHUB_READWRITE_TOKEN }}
       - name: asciidoctor-ghpages
         uses: manoelcampos/asciidoctor-ghpages-action@v2
         with: