ci: fix generate pipeline (#357)

.github/workflows/generate.yml

@@ -8,7 +8,7 @@ on:
       - "README.md"
 
 jobs:
-  test:
+  generate:
     permissions:
       contents: write
 
@@ -18,6 +18,17 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "^1.20.6"
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+          fetch-depth: 0
+
       - name: Run generate
         if: matrix.os == 'ubuntu-latest'
         run: make generate