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

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

stdlib/kubernetes/helm/helm.cue

@@ -47,7 +47,7 @@ import (
 	atomic: *true | bool @dagger(input)
 
 	// Kube config file
-	kubeconfig: dagger.#Secret @dagger(input)
+	kubeconfig: string @dagger(input)
 
 	// Helm version
 	version: *"3.5.2" | string @dagger(input)
@@ -86,6 +86,11 @@ import (
 			dest:    "/entrypoint.sh"
 			content: #code
 		},
+		op.#WriteFile & {
+			dest:    "/kubeconfig"
+			content: kubeconfig
+			mode:    0o600
+		},
 		if chart != _|_ {
 			op.#WriteFile & {
 				dest:    "/helm/chart"
@@ -125,7 +130,6 @@ import (
 				if chartSource != _|_ && chart == _|_ {
 					"/helm/chart": from: chartSource
 				}
-				"/kubeconfig": secret: kubeconfig
 			}
 		},
 	]