add docker build ci

.gitea/workflows/build.yml

@@ -0,0 +1,24 @@
+name: Build
+run-name: ${{ gitea.actor }} is running ${{ github.workflow }} on ${{ github.repository }}
+on: [ push ]
+
+jobs:
+  publish:
+    runs-on: cth-ubuntu-latest
+    if: gitea.ref == 'refs/heads/main'
+    steps:
+      - uses: https://github.com/actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: https://github.com/docker/setup-buildx-action@v3
+        with:
+        config-inline: |
+        [registry."172.21.0.1:5000"]
+          http = true
+          insecure = true
+      - name: Build and push Docker image
+      uses: https://github.com/docker/build-push-action@v5
+      with:
+      context: .
+      file: ./Dockerfile
+      push: true
+      tags: "172.21.0.1:5000/website"