fix: remove `pixi global` support on powerpc64le #256

Job	Run time
Cargo Machete	1m 5s
determine changes	25s
pre-commit	39s
build binary \| linux x86_64	3m 37s
build binary \| windows aarch64	3m 56s
build binary \| macos x86_64	0s
build binary \| macos aarch64	2m 40s
build binary \| windows x86_64	3m 46s
cargo test \| ubuntu	4m 22s
cargo test \| macos aarch64	5m 26s
cargo test \| macos x86_64	0s
cargo test \| windows	7m 37s
cargo rustdoc \| ubuntu	56s
cargo fmt \| ubuntu	16s
cargo clippy \| ubuntu	43s
pytest integration \| macos aarch64	2m 30s
test wheel installation \| macos aarch64 / Test Installation of Common Wheels \| macos-aarch64	2m 33s
pytest integration \| linux x86_64	9m 30s
test wheel installation \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1m 57s
pytest integration \| windows x86_64	5m 32s
test wheel installation \| windows x86_64 / Test Installation of Common Wheels \| windows-x86_64	4m 1s
	1h 1m 31s

Provide feedback