Revert kubernetes/helm packages and tests from secret to str type, needed for docs

Signed-off-by: Guillaume de Rouville <guillaume.derouville@gmail.com>

tests/stdlib/kubernetes/helm/helm.cue

@@ -8,7 +8,7 @@ import (
 
 // We assume that a kinD cluster is running locally
 // To deploy a local KinD cluster, follow this link : https://kind.sigs.k8s.io/docs/user/quick-start/
-kubeconfig: dagger.#Secret @dagger(input)
+kubeconfig: string @dagger(input)
 
 // Deploy user local chart
 TestHelmSimpleChart: {

tests/stdlib/kubernetes/helm/verify.cue

@@ -26,6 +26,12 @@ import (
 			content: #getHelmPods
 		},
 
+		op.#WriteFile & {
+			dest:    "/kubeconfig"
+			content: kubeconfig
+			mode:    0o600
+		},
+
 		op.#Exec & {
 			always: true
 			args: [
@@ -40,7 +46,6 @@ import (
 				KUBECONFIG:     "/kubeconfig"
 				KUBE_NAMESPACE: namespace
 			}
-			mount: "/kubeconfig": secret: kubeconfig
 		},
 	]
 }