fix(feature): build url shortener feature url with trailing slash

initUrlShortener() appended the branch directly to public_urls without a
trailing slash, so DEPLOYER_CONFIG_FEATURE_URL (TYPO3_BASEURL) became
"https://host/BRANCH". Consumer projects derive the site base and string-
concatenated values (e.g. %env(TYPO3_BASEURL)%sitemap.xml) from it, which
broke absolute URLs/breadcrumbs and caused 504 hangs.

Build the URL slash-robust so it always ends with "/" regardless of whether
public_urls is configured with or without a trailing slash:
rtrim($publicUrl, '/') . '/' . $feature . '/'.

NOTE: feature .env files are generated only once ("once generated"
feature_templates). Existing feature instances must re-init (re-run
feature:setup / re-generate .env) for the corrected URL to take effect.

Author: konradmichalik

deployer/feature/task/url_shortener.php

@@ -4,8 +4,12 @@
 
 tasK('feature:urlshortener', function () {
 
-    if (!input()->getOption('feature')) return;
-    if (!isUrlShortener()) return;
+    if (!input()->getOption('feature')) {
+        return;
+    }
+    if (!isUrlShortener()) {
+        return;
+    }
 
     $symlinkDir = get('deploy_path') . "/current/" . get('web_path');
 
@@ -35,15 +39,17 @@ function isUrlShortener(): bool
  */
 function initUrlShortener(?string $feature = null): void
 {
-    if (!isUrlShortener()) return;
+    if (!isUrlShortener()) {
+        return;
+    }
 
     debug('Adjust host configuration because of url shortener function');
     set('deploy_path_url_shortener', get('deploy_path'));
     set('deploy_path', get('deploy_path') . '/' . get('feature_url_shortener_path') . $feature);
 
     $publicUrls = [];
     foreach (get('public_urls') as $publicUrl) {
-        $publicUrls[] = $publicUrl . $feature;
+        $publicUrls[] = rtrim($publicUrl, '/') . '/' . $feature . '/';
     }
     set('public_urls', $publicUrls);
 }