fix(k8s): default to NFS for in-cluster builder storage for local k8s

Docker Desktop and minikube can't run docker-in-docker with the
default storage class (something to do with nested overlayfs).

Note: This is terribly slow, but at least works.

garden-service/src/plugins/kubernetes/local/config.ts

@@ -14,6 +14,7 @@ import { configureMicrok8sAddons } from "./microk8s"
 import { setMinikubeDockerEnv } from "./minikube"
 import { exec } from "../../../util/util"
 import { remove } from "lodash"
+import { getNfsStorageClass } from "../init"
 
 // TODO: split this into separate plugins to handle Docker for Mac and Minikube
 
@@ -129,6 +130,12 @@ export async function configureProvider(params: ConfigureProviderParams<LocalKub
     }
   }
 
+  // Docker Desktop, minikube and others are unable to run docker-in-docker overlayfs
+  // on top of their default storage class, so we override the default here to use the NFS storage class.
+  if (config.buildMode !== "local-docker" && !config.storage.builder.storageClass) {
+    config.storage.builder.storageClass = getNfsStorageClass(config)
+  }
+
   if (!config.defaultHostname) {
     config.defaultHostname = `${projectName}.local.app.garden`
   }

garden-service/test/data/test-projects/container/garden.yml

@@ -12,11 +12,6 @@ environments:
         imagePullSecrets:
           # Note: We populate this secret in the test code
           - name: test-docker-auth
-        # This is currently necessary for Docker Desktop, and potentially other local K8s distros
-        # Note: It is _terribly_ slow, so should only be used for testing.
-        storage:
-          builder:
-            storageClass: garden-system-nfs-v2
   - name: cluster-docker-buildkit
     providers:
       - <<: *clusterDocker