feat(file): make file non-challenge related by default

docs/resources/file.md

@@ -44,11 +44,11 @@ resource "ctfd_file" "http_file" {
 
 ### Required
 
-- `challenge_id` (String) Challenge of the file.
 - `name` (String) Name of the file as displayed to end-users.
 
 ### Optional
 
+- `challenge_id` (String) Challenge of the file.
 - `content` (String, Sensitive) Raw content of the file, perfectly fit the use-cases of a .txt document or anything with a simple binary content. You could provide it from the file-system using `file("${path.module}/...")`.
 - `contentb64` (String, Sensitive) Base 64 content of the file, perfectly fit the use-cases of complex binaries. You could provide it from the file-system using `filebase64("${path.module}/...")`.
 - `location` (String) Location where the file is stored on the CTFd instance, for download purposes.

provider/file_resource.go

@@ -60,7 +60,7 @@ func (r *fileResource) Schema(ctx context.Context, req resource.SchemaRequest, r
 			},
 			"challenge_id": schema.StringAttribute{
 				MarkdownDescription: "Challenge of the file.",
-				Required:            true,
+				Optional:            true,
 			},
 			"name": schema.StringAttribute{
 				MarkdownDescription: "Name of the file as displayed to end-users.",
@@ -291,9 +291,5 @@ func lookForChallengeId(ctx context.Context, client *api.Client, fileID int, dia
 			}
 		}
 	}
-	diags.AddError(
-		"Provider Error",
-		fmt.Sprintf("Unable to find challenge of file %d", fileID),
-	)
 	return types.StringNull()
 }