add CI workflow + demo-app

.gitea/workflows/build.yaml

@@ -0,0 +1,21 @@
+name: build-and-push
+on:
+  push:
+    branches: [main]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: 拉取代码
+        uses: https://gitea.com/actions/checkout@v4
+
+      - name: 登录 Harbor
+        run: |
+          echo "${{ secrets.HARBOR_PASS }}" | docker login \
+            harbor-harbor-registry.harbor.svc.cluster.local:5000 \
+            -u "${{ secrets.HARBOR_USER }}" --password-stdin
+
+      - name: 构建并推送镜像
+        run: |
+          docker build -t harbor-harbor-registry.harbor.svc.cluster.local:5000/slamduck/demo-app:v1 ./demo-app
+          docker push harbor-harbor-registry.harbor.svc.cluster.local:5000/slamduck/demo-app:v1

demo-app/Dockerfile

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+FROM nginx:alpine
+COPY index.html /usr/share/nginx/html/index.html

demo-app/index.html

@@ -0,0 +1 @@
+<h1>CI 构建的第一个应用20261102 v1</h1>