Add weekly build workflow to ensure regular builds even during quiet … #1163

Job	Run time
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	7m 17s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	5m 4s
Builds (macos-14, aarch64-apple-darwin, yes)	3m 0s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 55s
Builds (macos-latest, x86_64-apple-darwin, yes)	3m 1s
Builds (windows-latest, x86_64-pc-windows-msvc)	3m 58s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 21s
Builds (windows-latest, aarch64-pc-windows-msvc)	3m 54s
Tests (macos-latest, x86_64-apple-darwin, yes)	18m 3s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	4m 44s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 21s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	4m 53s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	4m 47s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 37s
Tests (macos-14, aarch64-apple-darwin, yes)	12m 18s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 23s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	1m 56s
	1h 33m 32s

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