Update .gitea/workflows/ci-demo.yaml

add gitea runner cache step

.gitea/workflows/ci-demo.yaml

@@ -22,7 +22,14 @@ jobs:
       - name: List files in the repository
         run: |
           ls ${{ gitea.workspace }}
-      - run: echo "🍏 This job's status is ${{ job.status }}."
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
       - name: Set up Docker Buildx
         uses: https://github.com/docker/setup-buildx-action@v3
       - name: Login to Docker Hub