chore(docs): add provider schema (#39)

Author: johnstcn

docs/index.md

@@ -3,12 +3,14 @@
 page_title: "envbuilder Provider"
 subcategory: ""
 description: |-
-  
+  The Envbuilder provider can be used to check for the presence of a container image previously built by Envbuilder https://github.com/coder/envbuilder.
+  This allows re-using a previously built image pushed to a container registry without having to rebuild it.
 ---
 
 # envbuilder Provider
 
-
+The Envbuilder provider can be used to check for the presence of a container image previously built by [Envbuilder](https://github.com/coder/envbuilder).
+This allows re-using a previously built image pushed to a container registry without having to rebuild it.
 
 ## Example Usage
 

internal/provider/provider.go

@@ -36,6 +36,9 @@ func (p *EnvbuilderProvider) Metadata(ctx context.Context, req provider.Metadata
 func (p *EnvbuilderProvider) Schema(ctx context.Context, req provider.SchemaRequest, resp *provider.SchemaResponse) {
 	resp.Schema = schema.Schema{
 		Attributes: map[string]schema.Attribute{},
+		MarkdownDescription: `
+The Envbuilder provider can be used to check for the presence of a container image previously built by [Envbuilder](https://github.com/coder/envbuilder).
+This allows re-using a previously built image pushed to a container registry without having to rebuild it.`,
 	}
 }