gitea-plugin: fix test

Dependencies

• [2] 3VSNQ6TJ Implement VM-test for gitea plugin
• [3] A4NSGFS3 LDAP: add VM test to flake.nix
• [4] 6SK7HL54 Make gitea public URL configurable
• [*] RWNXH3H2 lastModified -> lastModifiedDate

Change contents

• replacement in flake.nix at line 800
  [2.6039]→[2.6039:6130](∅→∅)
  − "su -l gitea -c 'GITEA_WORK_DIR=/var/lib/gitea gitea admin create-user "
  [2.6039]

  [2.6130]
  + "su -l gitea -c 'GITEA_WORK_DIR=/var/lib/gitea gitea admin user create "