ci: Do not mark container / pages jobs as interruptible

If another MR was merged while these were still running for the main
project, the result could be no updated images in the main project
registry (forcing a rebuild of the new images in all forked projects) or
an outdated Mesa website.

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6011>
2 files changed