feat(y2q): add opengist

- Add environment and environmentFile options to runit module to support environment variables
- Add opengist runit service that uses these options

home/modules/runit/services/opengist.nix

@@ -0,0 +1,20 @@
+{ pkgs, rootPath, ... }:
+
+{
+  runit.services.opengist = {
+    script = ''
+      exec ${pkgs.opengist}/bin/opengist start
+    '';
+    
+    environment = {
+      OG_HTTP_HOST = "127.0.0.1";
+      OG_HTTP_PORT = "6157";
+      OG_SSH_HOST = "127.0.0.1";
+      OG_SSH_PORT = "6522";
+    };
+
+    environmentFile = rootPath + /secrets/gitcrypt/opengist.env;
+
+    log.enable = true;
+  };
+}