automating k8s versions upgrade in tests with each gk release

.github/workflows/release-pr.yaml

@@ -89,6 +89,12 @@ jobs:
             fi
           done
           make version-docs NEWVERSION=v${MAJOR_VERSION}.${MINOR_VERSION}.x TAG=v${TAG} OPA_VERSIONS="${versions}"
+          # Fetch the latest 3 GA Kubernetes versions and double-quote them
+          k8s_versions=$(curl -s https://api.github.com/repos/kubernetes/kubernetes/releases \
+              | jq -r '[.[] | select(.prerelease == false) | .tag_name] | map(select(test("^v[0-9]+\\.[0-9]+\\.[0-9]+$"))) | .[:3] | map(ltrimstr("v")) | map("\"" + . + "\"") | join(", ")')
+
+          # Update the workflow.yaml file with the latest versions
+          sed -i "s/KUBERNETES_VERSION: \[.*\]/KUBERNETES_VERSION: \[$latest_versions\]/" workflow.yaml
 
       - name: Create release pull request
         uses: peter-evans/create-pull-request@5e914681df9dc83aa4e4905692ca88beb2f9e91f # v7.0.5