ci: Workaround virtiofs

Same as coreos/rpm-ostree#4585

.cci.jenkinsfile

@@ -43,12 +43,12 @@ cosaPod(runAsUser: 0, memory: "4608Mi", cpu: "4") {
       mkdir insttree
       tar -C insttree -xzvf insttree.tar.gz
       rsync -rlv insttree/ /
-      coreos-assembler init --force https://github.com/coreos/fedora-coreos-config
+      runuser -u builder -- coreos-assembler init --force https://github.com/coreos/fedora-coreos-config
       mkdir -p overrides/rootfs
       mv insttree/* overrides/rootfs/
       rmdir insttree
-      cosa fetch
-      cosa build
+      runuser -u builder -- cosa fetch
+      runuser -u builder -- cosa build
     """)
   }
   // The e2e-adopt test will use the ostree commit we just generated above
@@ -63,7 +63,7 @@ cosaPod(runAsUser: 0, memory: "4608Mi", cpu: "4") {
     }
     stage("Kola testing") {
       // The previous e2e leaves things only having built an ostree update
-      shwrap("cosa build")
+      shwrap("runuser -u builder -- cosa build")
       // bootupd really can't break upgrades for the OS
       kola(cosaDir: "${env.WORKSPACE}", extraArgs: "ext.*bootupd*", skipUpgrade: true, skipBasicScenarios: true)
     }

tests/e2e-update/e2e-update.sh

@@ -90,7 +90,7 @@ if test -z "${e2e_skip_build:-}"; then
     add_override grub2-2.06-70.fc37
     mv ${test_tmpdir}/yumrepo/packages/$(arch)/*.rpm ${overrides}/rpm/
     # Only build ostree update
-    runv cosa build ostree
+    runv runuser -u builder -- cosa build ostree
     undo_manifest_fork
 fi
 echo "Preparing test"
@@ -130,7 +130,7 @@ systemd:
 EOF
 runv butane -o ${testtmp}/test.ign ${testtmp}/test.bu
 cd ${testtmp}
-qemuexec_args=(kola qemuexec --propagate-initramfs-failure --qemu-image "${prev_image}" --qemu-firmware uefi \
+qemuexec_args=(runuser -u builder -- kola qemuexec --propagate-initramfs-failure --qemu-image "${prev_image}" --qemu-firmware uefi \
     -i test.ign --bind-ro ${COSA_DIR},/run/cosadir --bind-ro ${bootupd_git},/run/bootupd-source --bind-rw .,/run/testtmp)
 if test -n "${e2e_debug:-}"; then
     runv ${qemuexec_args[@]} --devshell