chore(docs): add provider schema

Author: johnstcn

docs/index.md

@@ -3,12 +3,19 @@
 page_title: "envbuilder Provider"
 subcategory: ""
 description: |-
-  
+  Envbuilder Provider
+  The Envbuilder provider can be used to check for the presence of a Docker image previously built by Envbuilder https://github.com/coder/envbuilder.
+  This allows re-using a previously built image pushed to a Docker registry without having to rebuild it.
+  An image built by Envbuilder also embeds the Envbuilder binary inside the image, allowing for the image to be used to build other images.
 ---
 
 # envbuilder Provider
 
+# Envbuilder Provider
 
+The Envbuilder provider can be used to check for the presence of a Docker image previously built by [Envbuilder](https://github.com/coder/envbuilder).
+This allows re-using a previously built image pushed to a Docker registry without having to rebuild it.
+An image built by Envbuilder also embeds the Envbuilder binary inside the image, allowing for the image to be used to build other images.
 
 ## Example Usage
 

internal/provider/provider.go

@@ -36,6 +36,12 @@ 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: `# Envbuilder Provider
+
+The Envbuilder provider can be used to check for the presence of a Docker image previously built by [Envbuilder](https://github.com/coder/envbuilder).
+This allows re-using a previously built image pushed to a Docker registry without having to rebuild it.
+An image built by Envbuilder also embeds the Envbuilder binary inside the image, allowing for the image to be used to build other images.
+`,
 	}
 }