wip: add export subcommand

Currently exports:

* Server name
* PDUs
* Public signing keys

src/cli.rs

@@ -13,6 +13,7 @@ use crate::{
 };
 
 mod check_config;
+mod export;
 mod serve;
 
 /// Command line arguments
@@ -33,6 +34,9 @@ pub(crate) enum Command {
 
     /// Check the configuration file for syntax and semantic errors.
     CheckConfig(CheckConfigArgs),
+
+    /// Export all persistent data.
+    Export(ExportArgs),
 }
 
 #[derive(clap::Args)]
@@ -44,6 +48,18 @@ pub(crate) struct CheckConfigArgs {
     observability: ObservabilityArgs,
 }
 
+#[derive(clap::Args)]
+pub(crate) struct ExportArgs {
+    #[clap(flatten)]
+    config: ConfigArg,
+
+    #[clap(flatten)]
+    observability: ObservabilityArgs,
+
+    #[clap(short, long)]
+    out_dir: PathBuf,
+}
+
 /// Wrapper for the `--config` arg.
 ///
 /// This exists to centralize the `mut_arg` code that sets the help value based
@@ -99,6 +115,9 @@ impl Args {
             Command::CheckConfig(args) => {
                 check_config::run(args.config).await?;
             }
+            Command::Export(args) => {
+                export::run(args).await?;
+            }
         }
         Ok(())
     }
@@ -113,6 +132,10 @@ impl Command {
                 args.observability.log_format,
                 args.observability.log_filter.clone(),
             )),
+            Command::Export(args) => Some((
+                args.observability.log_format,
+                args.observability.log_filter.clone(),
+            )),
             Command::Serve(_) => None,
         }
     }