add dev helper and docs

dev/dev-scenarios.nix

@@ -0,0 +1,45 @@
+# Extra scenarios for developing and debugging
+
+{ lib, scenarios }:
+
+with lib;
+{
+  btcpayserver-regtest = {
+    imports = [ scenarios.regtestBase ];
+    services.btcpayserver.enable = true;
+    test.container.exposeLocalhost = true;
+    # services.btcpayserver.lbtc = false;
+  };
+
+  # A node with internet access to test joinmarket-ob-watcher
+  jm-ob-watcher = {
+    services.joinmarket-ob-watcher.enable = true;
+    # Don't download blocks
+    services.bitcoind.extraConfig = ''
+      connect = 0;
+    '';
+    test.container.exposeLocalhost = true;
+    test.container.enableWAN = true;
+  };
+
+  rtl-dev = { config, pkgs, lib, ... }: {
+    imports = [
+      # scenarios.netnsBase
+      # scenarios.regtestBase
+    ];
+    services.rtl = {
+      enable = true;
+      nodes.clightning = {
+        enable = true;
+        extraConfig.Settings.themeColor = "INDIGO";
+      };
+      # nodes.lnd.enable = false;
+      # services.rtl.nodes.reverseOrder = true;
+      nightTheme = true;
+      extraCurrency = "CHF";
+    };
+    test.container.exposeLocalhost = true;
+    nix-bitcoin.nodeinfo.enable = true;
+    # test.container.enableWAN = true;
+  };
+}