Add envtest support

.github/workflows/ci.yaml

@@ -25,6 +25,8 @@ jobs:
       uses: golangci/golangci-lint-action@a4f60bb28d35aeee14e6880718e0c85ff1882e64 # v6.0.1
       with:
         version: v1.63.4
+    - name: Install env-test
+      run: go install sigs.k8s.io/controller-runtime/tools/setup-envtest@latest
     - name: Build
       run: make build-bin
     - name: Test

scripts/test.sh

@@ -1,3 +1,13 @@
 #!/bin/bash
 
-go test ./...
+if ! command -v setup-envtest; then
+	echo "setup-envtest is required for tests, but was not installed"
+	echo "see the 'Running Tests' section of the readme for install instructions"
+	exit 127
+fi
+
+minor=$(go mod graph | grep ' k8s.io/client-go@' | head -n1 | cut -d@ -f2 | cut -d '.' -f 2)
+version="1.$minor.x"
+
+export KUBEBUILDER_ASSETS=$(setup-envtest use -p path "$version")
+go test ./...