ci: fix golang runner - use go 1.26, remove -mod=readonly, add go mod tidy

.gitea/workflows/ci.yaml

@@ -9,10 +9,9 @@ jobs:
   test:
     runs-on: golang
     container:
-      image: golang:1.25
+      image: golang:1.26
     env:
       GOPRIVATE: forgejo.riotpiao.com
-      GOFLAGS: -mod=readonly
       GITHUB_TOKEN: ${{ secrets.REGISTRY_PAT }}
     steps:
       - name: Configure git authentication
@@ -20,22 +19,25 @@ jobs:
           git config --global url."https://oauth2:${{ secrets.REGISTRY_PAT }}@forgejo.riotpiao.com".insteadOf "https://forgejo.riotpiao.com"
           git config --global credential.helper store
           echo "https://oauth2:${{ secrets.REGISTRY_PAT }}@forgejo.riotpiao.com" >> ~/.git-credentials
-      
+
       - name: Checkout code
         run: |
           git init
           git remote add origin https://forgejo.riotpiao.com/rock/poimen-workflows.git
           git fetch origin ${{ github.ref_name }} --depth=1
           git checkout FETCH_HEAD
-      
+
       - name: Download dependencies
         run: go mod download
-      
+
+      - name: Tidy modules
+        run: go mod tidy
+
       - name: Test
         run: go test -v ./...
-      
+
       - name: Build
         run: go build -o /tmp/poimen-bin/ ./cmd/...
-      
+
       - name: Vet
         run: go vet ./...