feat: add Docker build and deployment workflow

.gitea/workflows/deploy.yaml

@@ -34,7 +34,23 @@ jobs:
         run: |
           cd ${{ gitea.workspace }}
           go test -cover ./...
+      - name: Go build
+        run: |
+          cd ${{ gitea.workspace }}
+          go build -ldflags "-X main.version=1.0.0-${{ gitea.sha }}" -o helloapp .
       - name: Check Docker
         run: |
           docker --version
+      - name: Build Docker image
+        run: |
+          cd ${{ gitea.workspace }}
+          docker build -t localhost:8180/k8s-example/k8s-example:${{ gitea.sha }} .
+      - name: Push Docker image to local registry
+        run: |
+          docker push localhost:8180/k8s-example/k8s-example:${{ gitea.sha }}
+      - name: Deploy to Kubernetes
+        run: |
+          cd ${{ gitea.workspace }}
+          sed -i "s|localhost:8180/k8s-example/k8s-example:latest|localhost:8180/k8s-example/k8s-example:${{ gitea.sha }}|g" .gitea/workflows/deploy.yaml
+          kubectl apply -f .gitea/workflows/deploy.yaml
       - run: echo "🍏 This job's status is ${{ job.status }}."