kernel-test.yml: increase VM memory

verifier_arena tests sometimes fail on s390x with OOM panic [1].
Increase VM memory from 4G to 6G to see if it helps.

s390x VMs have total 16G of memory and 2 runners, so there is
not a lot of room to push this value further.

[1] https://github.com/kernel-patches/vmtest/actions/runs/20624618585/job/59233294346

Signed-off-by: Ihor Solodrai <[email protected]>

Author: theihor

.github/workflows/kernel-test.yml

@@ -76,7 +76,7 @@ jobs:
           KERNEL_TEST: ${{ inputs.test }}
           SELFTESTS_BPF: ${{ github.workspace }}/selftests/bpf
           VMTEST_CONFIGS: ${{ github.workspace }}/ci/vmtest/configs
-          VMTEST_MEMORY: 4G
+          VMTEST_MEMORY: 6G
           VMTEST_NUM_CPUS: 4
           TEST_PROGS_TRAFFIC_MONITOR: ${{ inputs.arch == 'x86_64' && 'true' || '' }}
           TEST_PROGS_WATCHDOG_TIMEOUT: 600