build: fix ccache for crosscompile

[robin-reckmann]

ccache was not used when building the kernel image on non-aarch64 host system.

[github-actions]

vamOS System Profile

Changes vs master

Metric	Change
Used space	3490.0MB → 3491.3MB (+1.2MB)
Sparse image	3443.1MB → 3445.5MB (+2.3MB)
Package count	524 → 524

Added packages: MesaLib-devel-26.0.6_1, SPIRV-LLVM-Translator21-21.1.7_1, alsa-lib-1.2.15.3_1, alsa-lib-devel-1.2.15.3_1, btop-1.4.7_1, curl-8.20.0_1, dnssec-anchors-20260505_1, fontconfig-2.17.1_1, fontconfig-devel-2.17.1_1, git-2.54.0_1, libblkid-2.41.4_1, libblkid-devel-2.41.4_1, libcurl-8.20.0_1, libcurl-devel-8.20.0_1, libfdisk-2.41.4_1, libgbm-26.0.6_1, libgbm-devel-26.0.6_1, liblastlog2-2.41.4_1, libmount-2.41.4_1, libmount-devel-2.41.4_1, libsmartcols-2.41.4_1, libunbound-1.25.0_1, libuuid-2.41.4_1, libuuid-devel-2.41.4_1, mesa-26.0.6_1, mesa-dri-26.0.6_1, mesa-libgallium-26.0.6_1, mesa-opencl-26.0.6_1, removed-packages-0.1.20260503_1, sed-4.10_1, stress-ng-0.21.01_1, tzdata-2026b_1, util-linux-2.41.4_1, util-linux-common-2.41.4_1, wpa_supplicant-2.11_4, xfsprogs-6.19.0_1

Removed packages: MesaLib-devel-25.3.3_1, SPIRV-LLVM-Translator21-21.1.6_1, alsa-lib-1.2.15.1_2, alsa-lib-devel-1.2.15.1_2, btop-1.4.6_1, curl-8.19.0_1, dnssec-anchors-20230213_1, fontconfig-2.16.0_3, fontconfig-devel-2.16.0_3, git-2.53.0_1, libblkid-2.41.3_1, libblkid-devel-2.41.3_1, libcurl-8.19.0_1, libcurl-devel-8.19.0_1, libfdisk-2.41.3_1, libgbm-25.3.3_1, libgbm-devel-25.3.3_1, liblastlog2-2.41.3_1, libmount-2.41.3_1, libmount-devel-2.41.3_1, libsmartcols-2.41.3_1, libunbound-1.24.2_1, libuuid-2.41.3_1, libuuid-devel-2.41.3_1, mesa-25.3.3_1, mesa-dri-25.3.3_1, mesa-libgallium-25.3.3_1, mesa-opencl-25.3.3_1, removed-packages-0.1.20260131_1, sed-4.9_1, stress-ng-0.21.00_1, tzdata-2026a_1, util-linux-2.41.3_1, util-linux-common-2.41.3_1, wpa_supplicant-2.11_3, xfsprogs-6.14.0_1

Directory size changes (>1MB)

Directory	Change

---

Metric	Value
Used space	3491.3MB / 5959.5MB
Files	56114
Directories	4750
Symlinks	3606
Packages	524

Top 10 Directories

Directory	Size

Category Breakdown

Category	Size	%
xbps packages	2496.7MB	71.5%
Python venv	655.5MB	18.7%
Firmware	11.5MB	.3%
Other	327.5MB	9.3%

Top 10 Packages by Size

Package	Size
mit-krb5-libs-1.21.3_1	270.4MB
gawk-5.3.2_1	210.3MB
llvm-21_3	148.6MB
libldns-1.9.0_1	124.3MB
pd-mapper-1.0_1	73.9MB
libclang21-21.1.7_1	70.2MB
glib-2.88.0_1	67.4MB
gcc-14.2.1+20250405_4	65.4MB
libcap-progs-2.78_1	56MB
cmake-4.2.2_2	53.2MB

Top 30 Files by Size

File	Size
/usr/lib/llvm/21/lib/libLLVM.so.21.1	124.3MB
/usr/lib/llvm/21/lib/libMLIR.so.21.1	89.7MB
/usr/lib/llvm/21/bin/mlir-transform-opt	82.9MB
/usr/lib/llvm/21/lib/libclang-cpp.so.21.1	56MB
/usr/lib/llvm/21/bin/mlir-translate	53.2MB
/usr/lib/llvm/21/bin/llvm-exegesis	52MB
/usr/lib/llvm/21/bin/llvm-bolt-binary-analysis	50.6MB
/usr/local/venv/lib/python3.12/site-packages/ffmpeg/install/lib/libavcodec.a	50.5MB
/usr/bin/uv	48.5MB
/usr/lib/gcc/aarch64-linux-gnu/14.2/gnat1	40.1MB
/usr/bin/gdb	38.1MB
/usr/lib/gcc/aarch64-linux-gnu/14.2/cc1plus	37.3MB
/usr/lib/libgallium-26.0.6.so	36.6MB
/usr/lib/libllvm-qcom.so	35.2MB
/usr/lib/gcc/aarch64-linux-gnu/14.2/cc1	35.2MB
/usr/lib/gcc/aarch64-linux-gnu/14.2/lto1	33.9MB
/usr/bin/lto-dump	33.9MB
/usr/lib/libRusticlOpenCL.so.1.0.0	33.7MB
/usr/local/venv/bin/ruff	31.8MB
/usr/share/icu/78.2/icudt78l.dat	31.5MB
/usr/lib/llvm/21/lib/libclang.so.21.1.7	30.2MB
/usr/lib/llvm/21/bin/c-index-test	28.6MB
/usr/local/venv/lib/python3.12/site-packages/gcc_arm_none_eabi/toolchain/libexec/gcc/arm-none-eabi/13.2.1/cc1	28.2MB
/usr/lib/libz3.so	27.9MB
/usr/bin/run	26.6MB
/usr/local/venv/lib/python3.12/site-packages/numpy.libs/libscipy_openblas64_-71e1b124.so	23.6MB
/usr/comma/updater	23.5MB
/usr/comma/setup	23.5MB
/usr/comma/reset	23.5MB
/usr/local/uv/python/cpython-3.12.13-linux-aarch64-gnu/bin/python3.12	22.1MB