Hang during release build with UEFI

使用全局共享的 target 目录，通过 cargo b -r -vv 复现挂起问题，然后检查报告中描述的 build_uefi_bootloader 和 cargo install bootloader-x86_64-uefi 步骤。将其与隔离的临时 target 目录进行比较。当 release 构建在报告的配置下不再挂起，或明确记录该限制时，即视为完成。

Running cargo b -r -vv produces the following output where it hangs (seemingly indefinitely) at zero CPU usage:

[bootloader 0.11.5] warning: `bootloader-x86_64-bios-stage-2` (bin "bootloader-x86_64-bios-stage-2") generated 2 warnings
[bootloader 0.11.5]     Finished stage-2 [optimized] target(s) in 1.51s
[bootloader 0.11.5]    Replacing /home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin/bootloader-x86_64-bios-stage-2
[bootloader 0.11.5]     Replaced package `bootloader-x86_64-bios-stage-2 v0.11.5 (/tmp/bootloader/bios/stage-2)` with `bootloader-x86_64-bios-stage-2 v0.11.5 (/tmp/bootloader/bios/stage-2)` (executable `bootloader-x86_64-bios-stage-2`)
[bootloader 0.11.5] warning: be sure to add `/home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin` to your PATH to be able to run the installed binaries
[bootloader 0.11.5]     Finished stage-3 [optimized + debuginfo] target(s) in 1.52s
[bootloader 0.11.5]    Replacing /home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin/bootloader-x86_64-bios-stage-3
[bootloader 0.11.5]     Replaced package `bootloader-x86_64-bios-stage-3 v0.11.5 (/tmp/bootloader/bios/stage-3)` with `bootloader-x86_64-bios-stage-3 v0.11.5 (/tmp/bootloader/bios/stage-3)` (executable `bootloader-x86_64-bios-stage-3`)
[bootloader 0.11.5] warning: be sure to add `/home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin` to your PATH to be able to run the installed binaries
[bootloader 0.11.5]     Finished stage-4 [optimized + debuginfo] target(s) in 1.52s
[bootloader 0.11.5]    Replacing /home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin/bootloader-x86_64-bios-stage-4
[bootloader 0.11.5]     Replaced package `bootloader-x86_64-bios-stage-4 v0.11.5 (/tmp/bootloader/bios/stage-4)` with `bootloader-x86_64-bios-stage-4 v0.11.5 (/tmp/bootloader/bios/stage-4)` (executable `bootloader-x86_64-bios-stage-4`)
[bootloader 0.11.5] warning: be sure to add `/home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin` to your PATH to be able to run the installed binaries
[bootloader 0.11.5] cargo:rustc-env=BIOS_BOOT_SECTOR_PATH=/home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin/bootloader-x86_64-bios-boot-sector.bin
[bootloader 0.11.5] cargo:rustc-env=BIOS_STAGE_2_PATH=/home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin/bootloader-x86_64-bios-stage-2.bin
[bootloader 0.11.5] cargo:rustc-env=BIOS_STAGE_3_PATH=/home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin/bootloader-x86_64-bios-stage-3.bin
[bootloader 0.11.5] cargo:rustc-env=BIOS_STAGE_4_PATH=/home/fm208/.cargo/target/release/build/bootloader-ad4dca68f01168c6/out/bin/bootloader-x86_64-bios-stage-4.bin
    Building [=======================> ] 133/135: bootloader(build)    

I believe this is cargo install boot loader-x86_64-uefi hanging in build_uefi_bootloader due to my usage of a globally shared target-dir set in ~/.cargo/config.toml.

I can fix this by creating a temporary directory and overriding the target directory to use that, or override the target directory to create one in the root of the bootloader directory, or some other place. Also happy to close this as a WONTFIX, but I know quite a few people use a global directory to avoid large build directories cluttering their drive in different locations.