Add weekly build workflow to ensure regular builds even during quiet periods #1160

Job	Run time
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 20s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	4m 6s
Builds (windows-latest, aarch64-pc-windows-msvc)	3m 59s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 12s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	1m 58s
Tests (macos-latest, x86_64-apple-darwin, yes)	28m 15s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 0s
Builds (macos-latest, x86_64-apple-darwin, yes)	2m 51s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	26m 26s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 27s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 24s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	7m 20s
Builds (macos-14, aarch64-apple-darwin, yes)	1m 58s
Tests (macos-14, aarch64-apple-darwin, yes)	26m 56s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 36s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	4m 43s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	4m 59s
	2h 14m 30s

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