tox.ini (ubuntu-noble): Set IGNORE_MISSING_SYSTEM_PACKAGES=yes

tox.ini

@@ -207,6 +207,7 @@ setenv =
     # https://hub.docker.com/_/ubuntu?tab=description
     # as of 2024-02, latest=jammy=22.04, rolling=mantic=23.10, devel=noble=24.04
     # ubuntu-focal does not have libgap-dev
+    # ubuntu-noble does not have libbrial-dev
     #
     ubuntu:         SYSTEM=debian
     ubuntu:         BASE_IMAGE=ubuntu
@@ -227,6 +228,7 @@ setenv =
     ubuntu-lunar:     BASE_TAG=lunar
     ubuntu-mantic:    BASE_TAG=mantic
     ubuntu-noble:     BASE_TAG=noble
+    ubuntu-noble:                              IGNORE_MISSING_SYSTEM_PACKAGES=yes
     #
     # https://hub.docker.com/_/debian
     # debian-buster does not have libfreetype-dev (it only has libfreetype6-dev)