Provide TMPDIR for boot image repacking #1996

Job	Run time
build-lkm / build-lkm (android12-5.10, 226, 2024-11) / Build android12-5.10.226	10m 39s
build-lkm / build-lkm (android14-5.15, 167, 2024-11) / Build android14-5.15.167	24m 42s
build-lkm / build-lkm (android13-5.10, 223, 2024-11) / Build android13-5.10.223	12m 40s
build-lkm / build-lkm (android13-5.15, 167, 2024-11) / Build android13-5.15.167	12m 15s
build-lkm / build-lkm (android15-6.6, 57, 2024-12) / Build android15-6.6.57	28m 13s
build-lkm / build-lkm (android14-6.1, 115, 2024-12) / Build android14-6.1.115	25m 36s
build-ksud (aarch64-apple-darwin, macos-latest) / build	1m 56s
build-ksud (x86_64-apple-darwin, macos-latest) / build	1m 56s
build-ksud (aarch64-unknown-linux-musl, ubuntu-latest) / build	2m 29s
build-ksud (aarch64-linux-android, ubuntu-latest) / build	2m 24s
build-ksud (x86_64-linux-android, ubuntu-latest) / build	2m 27s
build-ksud (x86_64-unknown-linux-musl, ubuntu-latest) / build	3m 27s
build-ksud (x86_64-pc-windows-gnu, ubuntu-latest) / build	2m 25s
build-manager	3m 10s
	2h 14m 19s

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