feat: vmtest.sh: the boot loader test for every loader the ISO advertises

One VM per loader, Steam Machine (--fremont): Steamify's state as its menu sees it,
OS name untouched, loader identity, the DKMS modules for every kernel, Steamify's
loader-specific code (hdmi_remove_boot_param), a kernel update, and a reboot into
each of the two kernels. Headless by default with a log Konsole (--window shows
the VMs). Fails when an advertised loader has no test. Limine 41, systemd-boot 40,
GRUB 40 checks pass.

share/bootloader-test/boot-check.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+# Guest side: after a reboot, the running kernel has Steamify's modules.
+pass() { echo "PASS $*"; }; fail() { echo "FAIL $*"; }
+k=$(uname -r)
+echo "kernel: $k"; echo "cmdline: $(cut -c1-140 /proc/cmdline)"
+compgen -G "/usr/lib/modules/$k/updates/dkms/steamify-fremont-poweroff.ko*" >/dev/null && pass "power-off fix built for the running kernel" || fail "no power-off fix for $k"
+sudo dmesg | grep -q "steamify_fremont_poweroff" && pass "power-off fix loaded at boot" || fail "power-off fix not loaded"
+lsmod | grep -q '^leds_valve' && pass "leds_valve loaded" || fail "leds_valve not loaded"
+[[ -z "$(systemctl --failed --no-legend)" ]] && pass "no failed units" || { fail "failed units:"; systemctl --failed --no-legend; }