ci: Cancel existing runs when a new push happens

Signed-off-by: Vasiliy Stelmachenok <ventureo@cachyos.org>

Author: ventureoo

.github/workflows/build.yml

@@ -1,6 +1,10 @@
 name: Desktop ISO
 on: push
 
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ubuntu-latest

machines/cachyos-dailylive.conf

@@ -1,3 +1,4 @@
 guest_os="linux"
 disk_img="cachyos-dailylive/disk.qcow2"
+boot="legacy"
 iso="$(realpath "$(find -name "*.iso" | head -n1)")"