feat: add Gitea Actions workflow for Zot registry

Replace GitHub Actions with Gitea Actions to build and push
Docker images to the Zot registry.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/build-push.yaml

@@ -0,0 +1,38 @@
+name: Build and Push to Zot
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+env:
+  REGISTRY: zot0213.kro.kr
+  IMAGE_NAME: jovies
+
+jobs:
+  build-and-push:
+    runs-on: k3s-home
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Zot Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.ZOT_USERNAME }}
+          password: ${{ secrets.ZOT_PASSWORD }}
+
+      - name: Build and Push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./nextjs
+          file: ./Dockerfile
+          platforms: linux/arm64
+          push: true
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}