ci: allow `workflow_dispatch` pipeline creation #37

Job	Run time
xtask test & lint	1m 58s
lint (spirv-builder)	5m 29s
lint (cargo-gpu)	7m 4s
test (windows-2022, spirv-builder)	9m 36s
test (ubuntu-24.04, cargo-gpu)	7m 13s
test (windows-2022, cargo-gpu)	12m 7s
test (ubuntu-24.04, spirv-builder)	5m 47s
test (macOS-latest, cargo-gpu)	7m 1s
test (macOS-latest, spirv-builder)	9m 28s
test_success	2s
	1h 5m 45s

Provide feedback