ci: 添加Go模块缓存和Docker构建缓存

.gitea/workflows/build.yml

@@ -10,6 +10,9 @@ on:
       - master
       - dev
 
+env:
+  GO_VERSION: '1.25'
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -20,8 +23,15 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.25'
-          cache: false
+          go-version: ${{ env.GO_VERSION }}
+          cache: true
+
+      - name: Go cache info
+        run: |
+          echo "Go cache directory:"
+          go env GOCACHE
+          echo "Go module cache directory:"
+          go env GOMODCACHE
 
       - name: Install build tools
         run: sudo apt-get update && sudo apt-get install -y gcc
@@ -76,3 +86,5 @@ jobs:
             code.littlelan.cn/carrot_bbs/backend:latest
             code.littlelan.cn/carrot_bbs/backend:${{ github.sha }}
           platforms: linux/amd64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max