🐛 Fix showing the wrong join page URL in instructions

Why:
- The code was hard-coded to show "http://localhost:8080/join"
- The link however pointed to the correct page, because it was relative.

src/territory_bro/ui/settings_page.clj

@@ -10,6 +10,7 @@
             [ring.util.response :as response]
             [territory-bro.api :as api]
             [territory-bro.infra.authentication :as auth]
+            [territory-bro.infra.config :as config]
             [territory-bro.ui.css :as css]
             [territory-bro.ui.forms :as forms]
             [territory-bro.ui.html :as html]
@@ -177,7 +178,7 @@
                                 :hx-swap "outerHTML"}
         [:h2 (i18n/t "UserManagement.title")]
         [:p (-> (i18n/t "UserManagement.addUserInstructions")
-                (str/replace "{{joinPageUrl}}" "http://localhost:8080/join")
+                (str/replace "{{joinPageUrl}}" (str (:public-url config/env) "/join"))
                 (str/replace "<0>" "<a href=\"/join\">")
                 (str/replace "</0>" "</a>")
                 (h/raw))]

test/territory_bro/ui/settings_page_test.clj

@@ -213,16 +213,17 @@
 
           Users
 
-          To add users to this congregation, ask them to visit http://localhost:8080/join and copy their User ID
+          To add users to this congregation, ask them to visit https://beta.territorybro.com/join and copy their User ID
           from that page and send it to you.
 
           User ID []
           Add user
 
           Name              Email       Login method   Actions
           Esko Luontola                 Google         Remove user")
-         (-> (settings-page/view model)
-             html/visible-text))))
+         (binding [config/env {:public-url "https://beta.territorybro.com"}]
+           (-> (settings-page/view model)
+               html/visible-text)))))
 
 (deftest ^:slow save-congregation-settings!-test
   (with-fixtures [db-fixture api-fixture]