Handle kubeconfig contents or path in provider

[lblackstone]

Proposed changes

Previously, we only handled the contents of a kubeconfig
as configuration for the k8s provivder. This change now
additionally supports passing in the path to a kubeconfig.
An error is only returned if both of these options fail to
load a valid k8s configuration.

Related issues (optional)

Fix #1252

[jaxxstorm]

Love it!

[lukehoban]

Is it possible to also support a kubeconfig object? That is - the place that is somewhat fustrating in practive today is the .apply(JSON.stringify) we have all over our examples when using the @pulumi/eks package with @pulumi/kubernetes because the former exports an object and the latter expects a string.

[lblackstone]

Is it possible to also support a kubeconfig object? That is - the place that is somewhat fustrating in practive today is the .apply(JSON.stringify) we have all over our examples when using the @pulumi/eks package with @pulumi/kubernetes because the former exports an object and the latter expects a string.

This change fixes that as well. Tested with the following:

import * as k8s from "@pulumi/kubernetes";
import * as eks from "@pulumi/eks";

const cluster = new eks.Cluster("test", {
    providerCredentialOpts: {profileName: process.env.AWS_PROFILE},
});
const provider = new k8s.Provider("test", {kubeconfig: cluster.kubeconfig})
new k8s.core.v1.Namespace("test", undefined, {provider})

Do you want to perform this update? yes
Updating (pulumi-k8s-test-dev):
     Type                                   Name                                    Status
 +   pulumi:pulumi:Stack                    pulumi-k8s-test-pulumi-k8s-test-dev     created
 +   ├─ eks:index:Cluster                   test                                    created
 +   │  ├─ eks:index:ServiceRole            test-instanceRole                       created
 +   │  │  ├─ aws:iam:Role                  test-instanceRole-role                  created
 +   │  │  ├─ aws:iam:RolePolicyAttachment  test-instanceRole-3eb088f2              created
 +   │  │  ├─ aws:iam:RolePolicyAttachment  test-instanceRole-e1b295bd              created
 +   │  │  └─ aws:iam:RolePolicyAttachment  test-instanceRole-03516f97              created
 +   │  ├─ eks:index:ServiceRole            test-eksRole                            created
 +   │  │  ├─ aws:iam:Role                  test-eksRole-role                       created
 +   │  │  ├─ aws:iam:RolePolicyAttachment  test-eksRole-90eb1c99                   created
 +   │  │  └─ aws:iam:RolePolicyAttachment  test-eksRole-4b490823                   created
 +   │  ├─ pulumi-nodejs:dynamic:Resource   test-cfnStackName                       created
 +   │  ├─ aws:ec2:SecurityGroup            test-eksClusterSecurityGroup            created
 +   │  ├─ aws:iam:InstanceProfile          test-instanceProfile                    created
 +   │  ├─ aws:ec2:SecurityGroupRule        test-eksClusterInternetEgressRule       created
 +   │  ├─ aws:eks:Cluster                  test-eksCluster                         created
 +   │  ├─ aws:ec2:SecurityGroup            test-nodeSecurityGroup                  created
 +   │  ├─ aws:ec2:SecurityGroupRule        test-eksNodeClusterIngressRule          created
 +   │  ├─ aws:ec2:SecurityGroupRule        test-eksExtApiServerClusterIngressRule  created
 +   │  ├─ aws:ec2:SecurityGroupRule        test-eksClusterIngressRule              created
 +   │  ├─ aws:ec2:SecurityGroupRule        test-eksNodeIngressRule                 created
 +   │  ├─ aws:ec2:SecurityGroupRule        test-eksNodeInternetEgressRule          created
 +   │  ├─ aws:ec2:LaunchConfiguration      test-nodeLaunchConfiguration            created
 +   │  ├─ pulumi-nodejs:dynamic:Resource   test-vpc-cni                            created
 +   │  ├─ pulumi:providers:kubernetes      test-eks-k8s                            created
 +   │  ├─ kubernetes:core:ConfigMap        test-nodeAccess                         created
 +   │  ├─ aws:cloudformation:Stack         test-nodes                              created
 +   │  └─ pulumi:providers:kubernetes      test-provider                           created
 +   ├─ pulumi:providers:kubernetes         test                                    created
 +   └─ kubernetes:core:Namespace           test                                    created

Resources:
    + 30 created

Duration: 14m43s