file doesn't work unless it's a secret.

instead, we want to use webpassword and set an initial value, then
change it using the podman

containers/pihole/default.nix

@@ -22,7 +22,7 @@ in
     ];
     environment = {
       TZ = "America/Detroit";
-      WEBPASSWORD_FILE = "${directory}/webpass";
+      WEBPASSWORD = "CHANGE_ME_PLEASE!";
       FTLCONF_LOCAL_IPV4 = ip;
       INTERFACE = interface;
     };