fix(ci): use openbao .deb package for bao CLI install

Version 2.5.5 dropped the .zip distribution in favour of .deb / .rpm.
Also bump BAO_VERSION to 2.5.5 (latest).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KoJ6zVHxYtUKtSNXinmct7

Author: 2 people

.github/workflows/ci.yml

@@ -71,10 +71,10 @@ jobs:
       - name: Install bao CLI
         run: |
           curl -sSfL \
-            "https://github.com/openbao/openbao/releases/download/v${BAO_VERSION}/bao_${BAO_VERSION}_linux_amd64.zip" \
-            -o bao.zip
-          unzip -q bao.zip bao
-          sudo mv bao /usr/local/bin/bao
+            "https://github.com/openbao/openbao/releases/download/v${BAO_VERSION}/openbao_${BAO_VERSION}_linux_amd64.deb" \
+            -o openbao.deb
+          sudo dpkg -i openbao.deb
+          bao version
 
       - name: Start minikube
         uses: medyagh/setup-minikube@latest