ci: Setup python venv for cargo-zigbuild #254

Job	Run time
Format	13s
Check	1m 8s
Deny (advisories)	23s
Build dtk (ubuntu-latest, x86_64-unknown-linux-musl, linux-x86_64, zigbuild)	3m 15s
Deny (bans licenses sources)	18s
Build dtk (ubuntu-latest, i686-unknown-linux-musl, linux-i686, zigbuild)	3m 15s
Test (ubuntu-latest)	1m 48s
Build dtk (ubuntu-latest, aarch64-unknown-linux-musl, linux-aarch64, zigbuild)	3m 2s
Test (windows-latest)	3m 59s
Build dtk (windows-latest, i686-pc-windows-msvc, windows-x86, build)	4m 44s
Test (macos-latest)	1m 31s
Build dtk (windows-latest, x86_64-pc-windows-msvc, windows-x86_64, build)	5m 48s
Build dtk (windows-latest, aarch64-pc-windows-msvc, windows-arm64, build)	6m 35s
Build dtk (macos-latest, x86_64-apple-darwin, macos-x86_64, build)	2m 18s
Build dtk (macos-latest, aarch64-apple-darwin, macos-arm64, build)	2m 17s
Release	5s
	40m 39s

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