ci: connect verify step to caddy via container name

Runner now runs in a quadlet container on caddy-net, so 127.0.0.1
is the runner's own loopback. Reach the Caddy container by name
('caddy') with --connect-to keeping SNI/Host as the public hostname
so the right vhost matches.

.forgejo/workflows/deploy-content.yml

@@ -30,5 +30,7 @@ jobs:
 
       - name: Verify
         run: |
-          curl -ksI --resolve zddc.varasys.io:8443:127.0.0.1 \
+          # Runner is in a container on caddy-net; reach Caddy by container
+          # name. See deploy-release.yml in ZDDC for the same pattern.
+          curl -ksI --connect-to "zddc.varasys.io:8443:caddy:8443" \
               https://zddc.varasys.io:8443/ | head -3