Allow specifying alternative keys in panic key combo, fix optical disk eject handling

usr/libexec/security-misc/emerg-shutdown

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# Copyright (C) 2025 - 2025 ENCRYPTED SUPPORT LLC <adrelanos@whonix.org>
+# See the file COPYING for copying conditions.
+
+gcc \
+  -o \
+  /run/emerg-shutdown \
+  -static \
+  /usr/src/security-misc/emerg-shutdown.c \
+  || {
+    printf "%s\n" 'Could not compile force-shutdown executable!'
+    exit 1;
+  }
+
+readarray -t root_devices < <(/usr/libexec/helper-scripts/get-backing-devices-for-mountpoint '/');
+
+## memlockd daemonizes itself, so no need to background it
+memlockd -c /usr/share/security-misc/security-misc-memlockd.cfg
+
+OLDIFS="$IFS"
+IFS=','
+/run/emerg-shutdown "--devices=${root_devices[*]}" '--keys=KEY_LEFTCTRL|KEY_RIGHTCTRL,KEY_LEFTALT|KEY_RIGHTALT,KEY_DELETE' &
+IFS="$OLDIFS"
+sleep 1
+disown
+exit 0