fix: ignore trailing slash for autogenerated name (#7307)

- During the migration process, if a valid GitHub clone URL was pasted, https://github.com/yuvipanda/notebooksharing.space/, the form automatically generates an invalid Forgejo repository name that included the trailing slash.
- Change the regex used to generate the name to ignore the trailing slash.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7307
Reviewed-by: Otto <otto@codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: YuviPanda <yuvipanda@gmail.com>
Co-committed-by: YuviPanda <yuvipanda@gmail.com>

web_src/js/features/repo-migration.js

@@ -29,7 +29,7 @@ export function initRepoMigration() {
   cloneAddr?.addEventListener('change', () => {
     const repoName = document.getElementById('repo_name');
     if (cloneAddr.value && !repoName?.value) { // Only modify if repo_name input is blank
-      repoName.value = cloneAddr.value.match(/^(.*\/)?((.+?)(\.git)?)$/)[3];
+      repoName.value = cloneAddr.value.match(/^(.*\/)?((.+?)(\.git)?\/?)$/)[3];
     }
   });
 }