fix: use regctl for OCI-format push to Zot registry

Zot registry only accepts OCI Image Manifest format, not Docker v2.
Switched from docker push to regctl image import/copy.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/build-deploy.yml

@@ -15,18 +15,23 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
 
-      - name: Build and push Docker image
+      - name: Build and push Docker image (OCI format for Zot registry)
         run: |
-          docker login registry.storedbox.net \
-            -u ${{ secrets.DOCKER_USER }} \
-            -p ${{ secrets.DOCKER_PASSWORD }}
+          # Download regctl for OCI-compatible push (Zot requires OCI format)
+          curl -sL https://github.com/regclient/regclient/releases/latest/download/regctl-linux-amd64 \
+            -o /usr/local/bin/regctl && chmod +x /usr/local/bin/regctl
 
           docker build -t registry.storedbox.net/ollama-mcp:${{ github.sha }} .
           docker tag registry.storedbox.net/ollama-mcp:${{ github.sha }} \
             registry.storedbox.net/ollama-mcp:latest
 
-          docker push registry.storedbox.net/ollama-mcp:${{ github.sha }}
-          docker push registry.storedbox.net/ollama-mcp:latest
+          docker save registry.storedbox.net/ollama-mcp:${{ github.sha }} \
+            -o /tmp/ollama-mcp.tar
+          regctl image import registry.storedbox.net/ollama-mcp:${{ github.sha }} \
+            /tmp/ollama-mcp.tar
+          regctl image copy \
+            registry.storedbox.net/ollama-mcp:${{ github.sha }} \
+            registry.storedbox.net/ollama-mcp:latest
 
   deploy:
     runs-on: ubuntu-latest