Add weekly build workflow to ensure regular builds even during quiet periods #1068

Job	Run time
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 12s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 11s
Builds (windows-latest, aarch64-pc-windows-msvc)	3m 24s
Builds (windows-latest, x86_64-pc-windows-msvc)	3m 20s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	9m 25s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	1m 47s
Builds (macos-14, aarch64-apple-darwin, yes)	1m 28s
Builds (macos-latest, x86_64-apple-darwin, yes)	1m 40s
Tests (macos-latest, x86_64-apple-darwin, yes)	8m 44s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 26s
Tests (macos-14, aarch64-apple-darwin, yes)	11m 10s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 19s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 21s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 19s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	4m 16s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	4m 6s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	4m 35s
	1h 16m 43s

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