Add debug option (dumps YAML)

nix/process-compose/default.nix

@@ -24,6 +24,13 @@ in
         The final package that will run 'process-compose up' for this configuration.
       '';
     };
+    debug = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to dump the process-compose YAML file at start.
+      '';
+    };
   };
 
   config.outputs.package =
@@ -31,6 +38,7 @@ in
       inherit name;
       runtimeInputs = [ config.package ];
       text = ''
+        ${if config.debug then "cat ${config.outputs.settingsYaml}" else ""}
         process-compose up \
           -f ${config.outputs.settingsYaml} \
           ${config.outputs.upCommandArgs} \

test/flake.nix

@@ -15,9 +15,10 @@
       perSystem = { pkgs, lib, ... }: {
         # This adds a `self.packages.default`
         process-compose."default" = {
+          debug = true;
           tui = false;
           settings = {
-            environment = [ 
+            environment = [
               "DATAFILE=data.sqlite"
             ];
             processes = {