Add weekly build #877

Job	Run time
runefmt	1m 57s
docs	2m 5s
clippy	2m 24s
rustfmt	13s
basics	1s
miri_rune	6m 35s
msrv	2m 38s
no_default_features	1m 3s
miri_rune_alloc	4m 46s
build_feature (capture-io)	1m 3s
build_feature (cli,doc)	1m 40s
wasm	1m 18s
build_feature (cli,fmt)	1m 38s
no_std_minimal	2m 54s
build_feature (cli)	1m 39s
build_feature (workspace)	1m 4s
build_feature (languageserver)	1m 25s
build_feature (byte-code)	1m 5s
test	10m 39s
	46m 7s

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