Meta: Add SERENITY_USE_SDCARD to boot from an SD card

Author: https://github.com/mrkct
Commit: f7608ba269
Pull-request: https://github.com/SerenityOS/serenity/pull/18139
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/supercomputer7 ✅

Meta/build-image-qemu.sh

@@ -79,8 +79,8 @@ nearest_power_of_2() {
     done
     echo $p
 }
-if [ "$SERENITY_ARCH" = "aarch64" ]; then
-    # The Aarch64 port loads from an SD card, which must have a size that is a power of 2 
+if [ "$SERENITY_ARCH" = "aarch64" ] || { [ -n "$SERENITY_USE_SDCARD" ] && [ "$SERENITY_USE_SDCARD" -eq 1 ]; }; then
+    # SD cards must have a size that is a power of 2. The Aarch64 port loads from an SD card. 
     DISK_SIZE_BYTES=$(nearest_power_of_2 "$DISK_SIZE_BYTES")
 fi