Don't require 'exe_name'

[chshersh]

Currently, tool-sync requires to specify exe_name in the configuration. However, it often happens that the tool has exactly the same name as the repository. In this case, we could allow to not specify the exe_name field and default it to the repo name.

To achieve this, we should patch the tool configuration in relevant places (and add tests as well):

Relevant code:

• tool-sync/src/sync/configure.rs

  Lines 30 to 46 in cb339b0

  	/// Configure 'ToolInfo' completely from 'ConfigAsset'
  	fn full_configure(config_asset: &ConfigAsset) -> Option<ToolInfo> {
  	let owner = config_asset.owner.clone()?;
  	let repo = config_asset.repo.clone()?;
  	let exe_name = config_asset.exe_name.clone()?;
  	Some(ToolInfo {
  	owner,
  	repo,
  	exe_name,
  	asset_name: AssetName {
  	linux: config_asset.asset_name.linux.clone(),
  	macos: config_asset.asset_name.macos.clone(),
  	windows: config_asset.asset_name.windows.clone(),
  	},
  	})
  	}

• tool-sync/src/sync/configure.rs

  Lines 60 to 63 in cb339b0

  	exe_name: config_asset
  	.exe_name
  	.clone()
  	.unwrap_or_else(|| self.exe_name.clone()),