change cd pipeline to use ssh key

Author: hgschmie

.github/workflows/cd.yml

@@ -56,12 +56,13 @@ jobs:
           java-version: 21
           distribution: temurin
           cache: maven
-          server-id: github
-          server-password: SITE_DEPLOY
+
+      - uses: webfactory/[email protected]
+        with:
+          ssh-private-key: ${{ secrets.JDBI_GITHUB_IO_DEPLOY_KEY }}
 
       - name: deploy documentation
         env:
-          SITE_DEPLOY: ${{ secrets.SITE_DEPLOY_TOKEN  }}
           MAVEN_CONFIG: "-B -ff"
         run: |
           make deploy-site