Add setup-go action to job test.

This should fix errors related to covdata tool, like this one:
https://github.com/redhat-best-practices-for-k8s/certsuite-operator/actions/runs/17562681798/job/49882613661?pr=230#step:6:82

Author: greyerof

.github/workflows/pre-main.yaml

@@ -114,14 +114,19 @@ jobs:
           removeDefaultStorageClass: true
           removeControlPlaneTaint: true
 
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
       - name: Build operator
         run: ./scripts/ci/build.sh
 
       - name: Install cert-manager to cluster
         run: |
           kubectl apply -f https://github.com/jetstack/cert-manager/releases/latest/download/cert-manager.yaml
           kubectl wait --for=condition=ready pod --all=true -n cert-manager --timeout=5m
-      
+
       - name: Install consoleplugin CRD to cluster
         run: |
           kubectl apply -f https://raw.githubusercontent.com/openshift/api/master/console/v1/zz_generated.crd-manifests/90_consoleplugins-Default.crd.yaml