CI: Temporarily remove Tumbleweed

Due another docker issue - blocks clone3 syscall any distro using glibc
2.34 is unusable on GitHub Actions. That's what happened to openSUSE
Tumbleweed [1] (the first distro as Fedora 35 has not been released
yet).

In openSUSE job this issue causes zypper to abort => we cannot install
packages:

./ci/opensuse.sh: line 31:    27 Aborted                 (core dumped)
$zyp asciidoc autoconf automake clang findutils gcc git gzip iproute2
make kernel-default-devel keyutils-devel libacl-devel libaio-devel
libcap-devel libmnl-devel libnuma-devel libopenssl-devel
libselinux-devel libtirpc-devel linux-glibc-devel lsb-release perl-JSON
pkg-config

[1] https://bugzilla.opensuse.org/show_bug.cgi?id=1190670
[2] https://github.com/linux-test-project/ltp/runs/3685832145

Acked-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Petr Vorel <pvorel@suse.cz>

.github/workflows/ci.yml

@@ -76,11 +76,6 @@ jobs:
               CC: clang
               METADATA: asciidoc-pdf
 
-          - container: "opensuse/tumbleweed"
-            env:
-              CC: gcc
-              METADATA: asciidoctor
-
           - container: "opensuse/leap"
             env:
               CC: gcc