setup go before running go generate

.gitea/workflows/gen_code.yml

@@ -15,6 +15,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
       
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: 1.25
+
       - name: Save pre-generate git state
         run: git status --porcelain > pre-generate.txt