Drop the kvm tag

New flatdeb-builder docker image uses latest debos version and does not
require kvm to be run.

Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>

.gitlab-ci.yml

@@ -16,8 +16,6 @@ stages:
 .build:
   variables:
     GIT_STRATEGY: clone
-  tags:
-    - kvm
   before_script:
     - apt update
     - apt install -y binutils debootstrap debos flatpak ostree pigz python3 python3-debian python3-gi python3-yaml systemd-container time flatpak-builder