Add sqlite for tracking build history.

src/main.rs

@@ -12,18 +12,21 @@ use self::init_tracing::shutdown_telemetry;
 mod cli;
 mod command;
 mod config;
+mod database;
 mod error;
 mod fs_util;
 mod git_util;
 mod init_tracing;
 mod nix_util;
 
-fn main() -> Result<ExitCode, CustomError> {
+pub(crate) type Result<T> = std::result::Result<T, CustomError>;
+
+fn main() -> Result<ExitCode> {
     let rt = tokio::runtime::Runtime::new()?;
     rt.block_on(async { main_body().await })
 }
 
-async fn main_body() -> Result<ExitCode, CustomError> {
+async fn main_body() -> Result<ExitCode> {
     init_telemetry().expect("Telemetry should initialize successfully.");
     let args = Cli::parse();
     match args.command {