Use v2 TOML format for registries.conf

Match the format already used on the runner host.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/deploy.yaml

@@ -22,7 +22,7 @@ jobs:
       - name: Build and push container image
         run: |
           mkdir -p /etc/containers
-          printf '[registries.insecure]\nregistries = ["git.kimchi"]\n' > /etc/containers/registries.conf
+          printf '[[registry]]\nlocation = "git.kimchi"\ninsecure = true\n' > /etc/containers/registries.conf
 
           IMAGE_TAG="${{ env.IMAGE }}:sha-${GITHUB_SHA::8}"
           IMAGE_LATEST="${{ env.IMAGE }}:latest"