Checkout code and setup-go before linting

Author: bombsimon

.github/workflows/go.yaml

@@ -24,5 +24,12 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: "1.21"
+
       - name: "Run golangci-lint"
         uses: golangci/golangci-lint-action@v3