test-vm: Add WHIB backend

hosts/test-vm/whib-backend.nix

@@ -0,0 +1,54 @@
+{
+  lib,
+  config,
+  ...
+}:
+let
+  enabled = config.mod.whib-backend.enable;
+in
+{
+  options = {
+    mod.whib-backend = {
+      enable = lib.mkEnableOption "enable WHIB backend";
+    };
+  };
+
+  config = lib.mkIf enabled {
+    services.whib-backend = {
+      enable = true;
+      domain = "whib-backend.local";
+
+      backend = {
+        signingKey = "super-secret-key";
+      };
+
+      postgres = {
+        password = "postgrespassword";
+      };
+    };
+
+    virtualisation.vmVariant = {
+      virtualisation = {
+        sharedDirectories = {
+          my-shared = {
+            source = "/home/alex/whib-backup";
+            target = "/mnt/shared";
+          };
+        };
+
+        forwardPorts = [
+          {
+            from = "host";
+            host.port = 8080;
+            guest.port = 8080;
+          }
+          {
+            from = "host";
+            host.port = 5432;
+            guest.port = 5432;
+          }
+        ];
+      };
+    };
+  };
+}