ci: temporarily remove linux-i686-gcc build

ci: temporarily remove linux-i686-gcc build

GitHub Actions was recently enabled in commit ce1b5612ce99 ("ci: add CI
via GitHub Actions").

The new CI configuration was not properly tested before being merged,
as the linux-i686-gcc build currently fails for the master branch:
https://github.com/axboe/fio/actions

The problem appears to be related to ci/actions-install.sh wanting to
install broken packages on linux-i686-gcc.

The new CI configuration will also cause fio forks on GitHub to trigger
a GitHub Action (inside the forked repo) for every push.

Since the linux-i686-gcc build currently fails, this will currently cause
error emails to be sent out for every push to a forked repo.

In order to avoid spamming everyone who has forked fio on GitHub, let's
temporarily remove the linux-i686-gcc build until ci/actions-install.sh
specifies a working list of packages. Once that is done, this commit can
simply be reverted.

Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Link: https://lore.kernel.org/r/20211214111756.52968-1-Niklas.Cassel@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>