feat: git-based nightly versions

src/cli.rs

@@ -27,7 +27,7 @@ use coursebank::store;
 
 /// Manage course item banks, assessments, and the analysis that comes back.
 #[derive(Debug, Parser)]
-#[command(name = "coursebank", version, about, long_about = None)]
+#[command(name = "coursebank", version = env!("COURSEBANK_VERSION"), about, long_about = None)]
 pub(crate) struct Cli {
     /// Course directory, the one holding course.yaml.
     #[arg(long, short = 'C', global = true, default_value = ".")]
@@ -584,4 +584,4 @@ mod tests {
     fn the_cli_rejects_an_unknown_subcommand() {
         assert!(Cli::try_parse_from(["coursebank", "frobnicate"]).is_err());
     }
-}
+}