Make endpoint and token as optional from provider configuration (#43)

It seems the Configure function is invoked after schema initiation, by
setting the two fields as required Terraform asks for endpoint and token
without checking the environment variables as coded in
`Provider.Configure`

Author: stanleyz

docs/index.md

@@ -31,11 +31,8 @@ provider "terrakube" {
 <!-- schema generated by tfplugindocs -->
 ## Schema
 
-### Required
-
-- `endpoint` (String) Terrakube API Endpoint. Example: https://terrakube-api.minikube.net
-- `token` (String) Personal Access Token generated in Terrakube UI (https://docs.terrakube.io/user-guide/organizations/api-tokens)
-
 ### Optional
 
-- `insecure_http_client` (Boolean) Disable https certificate validation
+- `endpoint` (String) Terrakube API Endpoint. Example: https://terrakube-api.minikube.net, can also be specified with environment variable `TERRAKUBE_ENDPOINT`.
+- `insecure_http_client` (Boolean) Disable https certificate validation, default is `false`.
+- `token` (String) Access Token generated in Terrakube UI (https://docs.terrakube.io/user-guide/organizations/api-tokens), can also be specificed with environment variable `TERRAKUBE_TOKEN`.

internal/provider/provider.go

@@ -5,9 +5,10 @@ package provider
 
 import (
 	"context"
+	"os"
+
 	"github.com/hashicorp/terraform-plugin-framework/path"
 	"github.com/hashicorp/terraform-plugin-log/tflog"
-	"os"
 
 	"github.com/hashicorp/terraform-plugin-framework/datasource"
 	"github.com/hashicorp/terraform-plugin-framework/provider"
@@ -57,16 +58,16 @@ func (p *TerrakubeProvider) Schema(ctx context.Context, req provider.SchemaReque
 	resp.Schema = schema.Schema{
 		Attributes: map[string]schema.Attribute{
 			"endpoint": schema.StringAttribute{
-				Required:    true,
-				Description: "Terrakube API Endpoint. Example: https://terrakube-api.minikube.net",
+				Optional:    true,
+				Description: "Terrakube API Endpoint. Example: https://terrakube-api.minikube.net, can also be specified with environment variable `TERRAKUBE_ENDPOINT`.",
 			},
 			"token": schema.StringAttribute{
-				Required:    true,
-				Description: "Personal Access Token generated in Terrakube UI (https://docs.terrakube.io/user-guide/organizations/api-tokens)",
+				Optional:    true,
+				Description: "Access Token generated in Terrakube UI (https://docs.terrakube.io/user-guide/organizations/api-tokens), can also be specificed with environment variable `TERRAKUBE_TOKEN`.",
 			},
 			"insecure_http_client": schema.BoolAttribute{
 				Optional:    true,
-				Description: "Disable https certificate validation",
+				Description: "Disable https certificate validation, default is `false`.",
 			},
 		},
 	}